Orbicular Diorite
Scott Camazine
Mauna Loa Eruption #1
Phil Degginger
Basalt Columns, Iceland #2
John Shaw
Density Of Pumice #3
Photo Researchers, Inc.
Density Of Pumice #6
Photo Researchers, Inc.
Density Of Pumice
Photo Researchers, Inc.
Density Of Pumice #7
Photo Researchers, Inc.
Density Of Pumice #4
Photo Researchers, Inc.
Floating Pumice
Ted Kinsman
Floating Pumice #1
Ted Kinsman
Density Of Pumice #2
Photo Researchers, Inc.
Density Of Pumice #5
Photo Researchers, Inc.
Density Of Pumice #1
Photo Researchers, Inc.
Igneous Rocks
GIPhotoStock
Igneous Outcrop
E.r. Degginger
Basalt Columns, Iceland #1
John Shaw
Thurston Lava Tube Exit
Inga Spence
Chiricahua National Monument
Mark Newman
Moru Kopje, Serengeti
Gregory G. Dimijian, M.D.
Geologic Crumpling
Science Source
Cracked Rocks On Shore
Ted Kinsman
Lime Green Calcite #1
Millard H. Sharp
Remnant Of Igneous Sill In Big Bend
Gregory G. Dimijian, M.D.
Remnant Of Igneous Sill In Big Bend #1
Gregory G. Dimijian, M.D.
Basalt, An Igneous Rock
Andrew J. Martinez
Variety Of Igneous Rocks
A.b. Joyce
Variety Of Igneous Rocks #1
A.b. Joyce
Natural Jetty Formed By Igneous Rock
G. R. Roberts
Joshua Tree National Park, California
Ron Sanford
Granite From The Idaho Batholith
William Mullins
Black Basalt Dike Cut Through White #1
William Mullins
Imnaha Basalt, Oregon
William H. Mullins
Columnar Basalt
William H. Mullins
Eroding Rocks, California
Charlie Ott
Circle Creek Basin In City Of Rocks
William Mullins
Circle Creek Basin
William Mullins
Volcanic Tuff Formation In Leslie
William Mullins
Joshua Tree National Park #10
Mark Newman
Joshua Tree National Park #14
Mark Newman
Basalt Flows, Imnaha, Oregon
William H. Mullins
Granite #7
Phillip Hayson
Castle Rocks State Park, Idaho
William Mullins
Black Basalt Dike Cut Through White
William Mullins
The Devils Tower National Monument
Rafael Macia
Imnaha Basalt, Oregon #1
William H. Mullins
Imnaha Basalt, Oregon #2
William H. Mullins
Hiking In Big Bend, Texas
Gregory G. Dimijian, M.D.
Granite #2
Phillip Hayson
Granite #3
Phillip Hayson
Tumulus Lava Dome
William Mullins
City Of Rocks, Idaho
William Mullins
City Of Rocks, Idaho #1
William Mullins
Bartolome Island #2
William H. Mullins
Columnar Basalt In The Grand Canyon #1
William H. Mullins
Basalt Columns, Iceland
John Shaw
Bluestone Of Stonehenge #1
Ted Kinsman
Bluestone Of Stonehenge #2
Ted Kinsman
Pleaskin Head, Giants Causeway, 1890s
Science Source
Xenolith Contact
William Mullins
Columnar Basalt In The Grand Canyon
William H. Mullins
Enchanted Rock Exfoliating
Gregory G. Dimijian, M.D.