Tumuli in basalt flow, Iceland
tumulus
Feeder dike intruding tephra, Iceland
intrusive igneous
Diabase dike intruding metaconglomerate, NE Maine
igneous, intrusive, intrusion, mafic
Apophysis of basaltic intrusion in granite
igneous, intrusive, intrusion, mafic
Pyroclastics of 3.5Ka Minoan eruption, Santorini
tephra, students
Andesite stratovolcano, New Zealand
volcanic hazards
Lake-filled explosion crater, New Zealand
hydrothermal, volcanic hazards
Sulfur chimneys and fumaroles
steam vents, sulfur mineralization, sulphur
Large block in ash flow tuff, Colorado
pyroclastic, ignimbrite, volcanic
Columnar-jointed basalt, Oregon
lava, dwshed, columns, columnar, colonnade
Mt. St. Helens stratovolcano, Washington
Cascade volcanoes
Lava Flows of Columbia River Basalt Group, Washington
CRBG, columns, columnar, colonnade
Bandelier Tuff, Los Alamos, New Mexico
volcanic, ash flow tuff, welded, pyroclastic
Thurston Lava Tube, Hawaii
basaltic, volcanic
Flowing pahoehoe, Hawaii. (vertical)
basalt, volcanic, igneous, hot spot
Cascade Volcanoes, Washington
volcanic, stratovolcano, andesite, igneous, arc, Cascade volcanoes
Cross-section of cinder cone, SE California.
igneous, explosive volcanic, volcanism