Igneous
![Christine Falls and Tatoosh granodiorite, Mount Rainier National](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/06/150910-14f.jpg?resize=495%2C400&ssl=1)
Christine Falls and Tatoosh granodiorite, Mount Rainier NationalChristine Falls cuts a narrow slot through Tatoosh granodiorite, Mount Rainier National Park
![Hand Samples of Intrusive igneous Rocks Intrusive igneous Rocks](https://i0.wp.com/geologypics.com/wp-content/uploads/2012/03/ig-26.jpg?resize=495%2C400&ssl=1)
Hand Samples of Intrusive igneous RocksFrom left to right, these rocks are arranged in order of decreasing silica content: granite, diorite, and gabbro.
![Hand Samples of Volcanic Rocks Volcanic Rocks](https://i0.wp.com/geologypics.com/wp-content/uploads/2012/03/ig-85.jpg?resize=495%2C400&ssl=1)
Hand Samples of Volcanic RocksFrom left to right, these rocks are arranged in order of decreasing silica content: rhyolite, andesite, and basalt.
![Granite and Moon. Sierra Nevada, CA. granite boulder](https://i0.wp.com/geologypics.com/wp-content/uploads/2012/03/ig-03.jpg?resize=495%2C400&ssl=1)
Granite and Moon. Sierra Nevada, CA.A typical exposure of granite --coarse grained with an interlocking, random assortment of crystals.
![Mt. Whitney and Sierra Nevada, California at sunrise. Mt. Whitney at Sunrise](https://i0.wp.com/geologypics.com/wp-content/uploads/2012/03/ig-02.jpg?resize=495%2C400&ssl=1)
Mt. Whitney and Sierra Nevada, California at sunrise.Mt. Whitney and Sierra Nevada, California at sunrise. Mt. Whitney's elevation is 14, 505' above sea level, the highest spot in the conterminous US. The rock in this photograph is almost entirely granodiorite.
![Intrusive contact granite intruding sedimentary rock](https://i0.wp.com/geologypics.com/wp-content/uploads/2012/03/ig-05.jpg?resize=495%2C400&ssl=1)
Intrusive contactCretaceous granite intruding Cambrian sedimentary rock, Sierra Nevada Range.
![Granite sill intruding gneiss, Colorado.](https://i0.wp.com/geologypics.com/wp-content/uploads/2014/09/ig-23.jpg?resize=495%2C400&ssl=1)
Granite sill intruding gneiss, Colorado.
![Ig-08](https://i0.wp.com/geologypics.com/wp-content/uploads/2015/04/ig-08.jpg?resize=495%2C400&ssl=1)
Ig-08pegmatite dike and sill intruding mylonitic gneiss
![Mt. Whitney Cretaceous Granodiorite Mt. Whitney Cretaceous granodiorite](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-01.jpg?resize=495%2C400&ssl=1)
Mt. Whitney Cretaceous GranodioriteAt an elevation of 14,505, Mt. Whitney reaches the highest peak in the conterminous United States, and like much of the Sierra Nevada, it consists of Cretaceous granodiorite, a rock intermediate in composition between granite and diorite. (Image ID # Ig-01
![Cretaceous granodiorite, Yosemite NP, CA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-04.jpg?resize=479%2C400&ssl=1)
Cretaceous granodiorite, Yosemite NP, CA.
![Granitic rock and moon. Sierra Nevada, CA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-03.jpg?resize=495%2C400&ssl=1)
Granitic rock and moon. Sierra Nevada, CA.
![Intrusive contact: granitic rock and metasedimentary rock in roo](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-05.jpg?resize=495%2C400&ssl=1)
Intrusive contact: granitic rock and metasedimentary rock in roo
![Triassic metavolcanic rock of the southern Sierra Nevada. Triassic metavolcanic rock of the southern Sierra Nevada.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-06.jpg?resize=495%2C400&ssl=1)
Triassic metavolcanic rock of the southern Sierra Nevada.Cretaceous granodiorite can be seen intruding Triassic metavolcanic rock of the southern Sierra Nevada. The volcanic rock was contact metamorphosed by the intruding granite
(Image ID# Ig-06)
(Image ID# Ig-06)
![Intrusive contact: granitic rock and metasedimentary rock in roo](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-07.jpg?resize=495%2C400&ssl=1)
Intrusive contact: granitic rock and metasedimentary rock in roo
![Pegmatite intruding basement gneiss , California Pegmatite intruding basement gneiss , California](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-08.jpg?resize=495%2C400&ssl=1)
Pegmatite intruding basement gneiss , CaliforniaNote how irregular the contact is between the two, and the small sill of pegmatite intruding along foliation in the gneiss. (Image ID # Ig-08)
![Road covered by recent lava flow, Hawaii.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-100.jpg?resize=495%2C400&ssl=1)
Road covered by recent lava flow, Hawaii.
![Granitic dike intruding gneiss, Teton Range, WY.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-10.jpg?resize=495%2C400&ssl=1)
Granitic dike intruding gneiss, Teton Range, WY.
![Ig-102](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-102.jpg?resize=495%2C400&ssl=1)
Ig-102
![mafic dike intruding gneiss. Note fault.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-09.jpg?resize=495%2C400&ssl=1)
mafic dike intruding gneiss. Note fault.
![Ig-101](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-101.jpg?resize=495%2C400&ssl=1)
Ig-101
![Pahoehoe lava, Hawaii.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-103.jpg?resize=491%2C400&ssl=1)
Pahoehoe lava, Hawaii.
![Pillow basalt, Lopez Island, WA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-104.jpg?resize=481%2C400&ssl=1)
Pillow basalt, Lopez Island, WA.
![Phreatic explosion craters. Little Hebe Craters, Death Valley,](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-108.jpg?resize=495%2C400&ssl=1)
Phreatic explosion craters. Little Hebe Craters, Death Valley,
![Metamorphosed pillow basalt (Purcell Lavas--greenstone), Glacier](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-105.jpg?resize=495%2C400&ssl=1)
Metamorphosed pillow basalt (Purcell Lavas--greenstone), Glacier
![Ig-12](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-12.jpg?resize=495%2C400&ssl=1)
Ig-12
![Phreatic explosion craters. Ubehebe Crater, Death Valley, CA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-107.jpg?resize=495%2C400&ssl=1)
Phreatic explosion craters. Ubehebe Crater, Death Valley, CA.
![Mafic dike intruding sedimentary rock, SE Cal.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-13.jpg?resize=495%2C400&ssl=1)
Mafic dike intruding sedimentary rock, SE Cal.
![Apophyses of granitic rock intruding gneiss, NV.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-15.jpg?resize=495%2C400&ssl=1)
Apophyses of granitic rock intruding gneiss, NV.
![Ig-17](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-17.jpg?resize=495%2C400&ssl=1)
Ig-17
![Dioritic inclusions in granitic dike intruding slate, southern B](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-16.jpg?resize=495%2C400&ssl=1)
Dioritic inclusions in granitic dike intruding slate, southern B
![Phreatic explosion craters. Little Hebe Craters, Death Valley,](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-106.jpg?resize=495%2C400&ssl=1)
Phreatic explosion craters. Little Hebe Craters, Death Valley,
![Aplite dike in granite.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-14.jpg?resize=495%2C400&ssl=1)
Aplite dike in granite.
![Ig-18](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-18.jpg?resize=495%2C400&ssl=1)
Ig-18
![sills of pegmatite in gneiss.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-19.jpg?resize=495%2C400&ssl=1)
sills of pegmatite in gneiss.
![Diabase sill in marble, southern Death Valley, CA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-20.jpg?resize=495%2C400&ssl=1)
Diabase sill in marble, southern Death Valley, CA.
![Diorite sill (Purcell sill) intruding Precambrian Belt Supergrou](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-24.jpg?resize=495%2C400&ssl=1)
Diorite sill (Purcell sill) intruding Precambrian Belt Supergrou
![Granite sill intruding gneiss, Colorado.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-23.jpg?resize=495%2C400&ssl=1)
Granite sill intruding gneiss, Colorado.
![Diabase sills (green) in limestone, SE Cal.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-21.jpg?resize=495%2C400&ssl=1)
Diabase sills (green) in limestone, SE Cal.
![pegmatite sill in gneiss.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-22.jpg?resize=495%2C400&ssl=1)
pegmatite sill in gneiss.
![Ig-26](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-26.jpg?resize=495%2C400&ssl=1)
Ig-26
![Granodiorite.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-27.jpg?resize=495%2C400&ssl=1)
Granodiorite.
![Cross-cutting relations: 1st the mafic inclusion; 2nd the granod](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-31.jpg?resize=495%2C400&ssl=1)
Cross-cutting relations: 1st the mafic inclusion; 2nd the granod
![Garnet Peridotite](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-28.jpg?resize=495%2C400&ssl=1)
Garnet Peridotite
![Pegmatite veins in diorite.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-32.jpg?resize=495%2C400&ssl=1)
Pegmatite veins in diorite.
![Pegmatite sill and gneiss, Colorado.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-33.jpg?resize=495%2C400&ssl=1)
Pegmatite sill and gneiss, Colorado.
![Pegmatite dike, Teton Range, WY.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-36.jpg?resize=495%2C400&ssl=1)
Pegmatite dike, Teton Range, WY.
![Pegmatite dike intruding gneiss, Colorado.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-34.jpg?resize=495%2C400&ssl=1)
Pegmatite dike intruding gneiss, Colorado.
![Slate inclusions in granite, Wasatch Mtns., Utah.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-30.jpg?resize=495%2C400&ssl=1)
Slate inclusions in granite, Wasatch Mtns., Utah.
![Mt. Rainier, WA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-37.jpg?resize=495%2C400&ssl=1)
Mt. Rainier, WA.
![Stratified cumulate minerals, Stillwater Complex, MT. Dark laye](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-35.jpg?resize=495%2C400&ssl=1)
Stratified cumulate minerals, Stillwater Complex, MT. Dark laye
![Mt. Rainier, WA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-38.jpg?resize=495%2C400&ssl=1)
Mt. Rainier, WA.
![Sill intruding Dolomite of the Helena Formation, Glacier National Park, Montana Sill intruding Dolomite of the Helena Formation, Glacier National Park, Montana](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-25.jpg?resize=495%2C400&ssl=1)
Sill intruding Dolomite of the Helena Formation, Glacier National Park, MontanaThe dark band in this cliff face is the Purcell Sill, and diorite sill that intrudes rock of the Proterozoic Belt Supergroup in Glacier National Park. The white rock on either side of the sill is bleached because of the contact metamorphism. (Image ID# lg-25)
![Mt. Rainier and Seattle, WA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-40.jpg?resize=495%2C400&ssl=1)
Mt. Rainier and Seattle, WA.
![Ig-39](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-39.jpg?resize=495%2C400&ssl=1)
Ig-39
![Mt. Hood, OR. View North to Mt. Rainier, WA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-42.jpg?resize=491%2C400&ssl=1)
Mt. Hood, OR. View North to Mt. Rainier, WA.
![Crater and dome of Mt. St. Helens, WA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-44.jpg?resize=495%2C400&ssl=1)
Crater and dome of Mt. St. Helens, WA.
![Ig-46](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-46.jpg?resize=495%2C400&ssl=1)
Ig-46
![Ig-47](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-47.jpg?resize=495%2C400&ssl=1)
Ig-47
![Geologists in crater of Mt. St. Helens, WA](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-43.jpg?resize=495%2C400&ssl=1)
Geologists in crater of Mt. St. Helens, WA
![Rhyolitic Obsidian Flow, Newberry Volcano, OR.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-49.jpg?resize=495%2C400&ssl=1)
Rhyolitic Obsidian Flow, Newberry Volcano, OR.
![Cascade Volcanoes, OR.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-48.jpg?resize=495%2C400&ssl=1)
Cascade Volcanoes, OR.
![Mt. Shasta, CA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-50.jpg?resize=495%2C400&ssl=1)
Mt. Shasta, CA.
![Ig-51](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-51.jpg?resize=495%2C400&ssl=1)
Ig-51
![Caldera and cinder cone: Crater Lake and Wizard Island, OR](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-52.jpg?resize=495%2C400&ssl=1)
Caldera and cinder cone: Crater Lake and Wizard Island, OR
![Lassen Peak, CA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-54.jpg?resize=495%2C400&ssl=1)
Lassen Peak, CA.
![Obsidian.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-56.jpg?resize=495%2C400&ssl=1)
Obsidian.
![Obsidian flow and South Sister volcano, OR.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-55.jpg?resize=495%2C400&ssl=1)
Obsidian flow and South Sister volcano, OR.
![Caldera. Long Valley caldera, CA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-57.jpg?resize=495%2C400&ssl=1)
Caldera. Long Valley caldera, CA.
![Crater and dome of Mt. St. Helens, WA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-45.jpg?resize=495%2C400&ssl=1)
Crater and dome of Mt. St. Helens, WA.
![Caldera and cinder cone: Crater Lake and Wizard Island, OR](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-53.jpg?resize=495%2C400&ssl=1)
Caldera and cinder cone: Crater Lake and Wizard Island, OR
![Tertiary tuff at Smith Rocks State Park, OR.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-60.jpg?resize=495%2C400&ssl=1)
Tertiary tuff at Smith Rocks State Park, OR.
![Bandelier Tuff, New Mexico.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-59.jpg?resize=489%2C400&ssl=1)
Bandelier Tuff, New Mexico.
![Welded tuff and vitrophyre, SE Cal.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-61.jpg?resize=495%2C400&ssl=1)
Welded tuff and vitrophyre, SE Cal.
![Pumice deposit, Idaho](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-63.jpg?resize=495%2C400&ssl=1)
Pumice deposit, Idaho
![Plug dome and Mono Lake, CA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-58.jpg?resize=478%2C400&ssl=1)
Plug dome and Mono Lake, CA.
![Lahar deposit, SE Cal.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-66.jpg?resize=495%2C400&ssl=1)
Lahar deposit, SE Cal.
![Ig-65](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-65.jpg?resize=495%2C400&ssl=1)
Ig-65
![Tilted ash deposit, SE Cal.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-62.jpg?resize=495%2C400&ssl=1)
Tilted ash deposit, SE Cal.
![Lahar deposit, S. Colorado.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-67.jpg?resize=495%2C400&ssl=1)
Lahar deposit, S. Colorado.
![Basalt overylying rhyolite at Twin Falls, Idaho.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-68.jpg?resize=495%2C400&ssl=1)
Basalt overylying rhyolite at Twin Falls, Idaho.
![Flow-banded rhyolite.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-69.jpg?resize=495%2C400&ssl=1)
Flow-banded rhyolite.
![Yellowstone ash deposit in SE Cal.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-64.jpg?resize=495%2C400&ssl=1)
Yellowstone ash deposit in SE Cal.
![Welded tuff.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-71.jpg?resize=495%2C400&ssl=1)
Welded tuff.
![Lithophysae in obsidian.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-72.jpg?resize=495%2C400&ssl=1)
Lithophysae in obsidian.
![Porphyritic andesite.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-76.jpg?resize=495%2C400&ssl=1)
Porphyritic andesite.
![Pyroclastic rock.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-70.jpg?resize=495%2C400&ssl=1)
Pyroclastic rock.
![Volcanic neck: Agathala Peak, Arizona.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-74.jpg?resize=495%2C400&ssl=1)
Volcanic neck: Agathala Peak, Arizona.
![Pumice floating in water.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-75.jpg?resize=495%2C400&ssl=1)
Pumice floating in water.
![Rhyolite flow, Yellowstone NP.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-77.jpg?resize=495%2C400&ssl=1)
Rhyolite flow, Yellowstone NP.
![Basalt flow, northern BC Canada. Note that it shows the upper a](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-78.jpg?resize=495%2C400&ssl=1)
Basalt flow, northern BC Canada. Note that it shows the upper a
![Recently erupted basalt on Snake River Plain, Idaho.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-81.jpg?resize=495%2C400&ssl=1)
Recently erupted basalt on Snake River Plain, Idaho.
![Aa and pahoehoe lava, Idaho.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-79.jpg?resize=495%2C400&ssl=1)
Aa and pahoehoe lava, Idaho.
![Columbia River and Columbia River Basalts, OR-WA. Washington on](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-83.jpg?resize=495%2C400&ssl=1)
Columbia River and Columbia River Basalts, OR-WA. Washington on
![Ig-84](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-84.jpg?resize=495%2C400&ssl=1)
Ig-84
![Ig-85](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-85.jpg?resize=495%2C400&ssl=1)
Ig-85
![Cross-section of basaltic columns, Devil's Postpile NM, CA. Gro](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-86.jpg?resize=495%2C400&ssl=1)
Cross-section of basaltic columns, Devil's Postpile NM, CA. Gro
![Collapsed lava tube and cinder cones on shield volcano: Medicine](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-87.jpg?resize=495%2C400&ssl=1)
Collapsed lava tube and cinder cones on shield volcano: Medicine
![Pahoehoe and Pele's Hair, Hawaii.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-80.jpg?resize=495%2C400&ssl=1)
Pahoehoe and Pele's Hair, Hawaii.
![Ig-88](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-88.jpg?resize=495%2C400&ssl=1)
Ig-88
![Cinder cones and aa flow, N. California.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-89.jpg?resize=495%2C400&ssl=1)
Cinder cones and aa flow, N. California.
![NE rift of Mauna Loa volcano, Hawaii.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-92.jpg?resize=495%2C400&ssl=1)
NE rift of Mauna Loa volcano, Hawaii.
![Columnar jointing in basalt flow, WA.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-82.jpg?resize=495%2C400&ssl=1)
Columnar jointing in basalt flow, WA.
![Cinder cone and flow, Mauna Loa, Hawaii.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-90.jpg?resize=495%2C400&ssl=1)
Cinder cone and flow, Mauna Loa, Hawaii.
![Cinder cone and flow, Lassen NP, Cal.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-91.jpg?resize=495%2C400&ssl=1)
Cinder cone and flow, Lassen NP, Cal.
![Erupting cinder cone: Pu u Oo, Hawaii.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-95.jpg?resize=495%2C400&ssl=1)
Erupting cinder cone: Pu u Oo, Hawaii.
![Ig-94](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-94.jpg?resize=495%2C400&ssl=1)
Ig-94
![Ig-98](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-98.jpg?resize=495%2C400&ssl=1)
Ig-98
![Pahoehoe lava, Hawaii.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-97.jpg?resize=495%2C400&ssl=1)
Pahoehoe lava, Hawaii.
![Paleosol at base of basalt flow, Idaho.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-96.jpg?resize=495%2C400&ssl=1)
Paleosol at base of basalt flow, Idaho.
![Pahoehoe lava, Hawaii.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-99.jpg?resize=495%2C400&ssl=1)
Pahoehoe lava, Hawaii.
![Vertical cut through cinder cone, SE California.](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Ig-93.jpg?resize=495%2C400&ssl=1)
Vertical cut through cinder cone, SE California.