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.
Floating Pumice #1
Ted Kinsman
Density Of Pumice #4
Photo Researchers, Inc.
Floating Pumice
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
Glacial Erratics
Ted Kinsman
Cracked Rocks On Shore
Ted Kinsman
Chiricahua National Monument
Mark Newman
Moru Kopje, Serengeti
Gregory G. Dimijian, M.D.
Geologic Crumpling
Science Source
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
Eroding Rocks, California
Charlie Ott
Granite From The Idaho Batholith
William Mullins
Black Basalt Dike Cut Through White #1
William Mullins
Joshua Tree National Park #10
Mark Newman
Joshua Tree National Park #14
Mark Newman
Basalt Flows, Imnaha, Oregon
William H. Mullins
Imnaha Basalt, Oregon
William H. Mullins
Columnar Basalt
William H. Mullins
Circle Creek Basin In City Of Rocks
William Mullins
Circle Creek Basin
William Mullins
Volcanic Tuff Formation In Leslie
William Mullins
Black Basalt Dike Cut Through White
William Mullins
Hiking In Big Bend, Texas
Gregory G. Dimijian, M.D.
Granite #3
Phillip Hayson
Granite #7
Phillip Hayson
Castle Rocks State Park, Idaho
William Mullins
The Devils Tower National Monument
Rafael Macia
Imnaha Basalt, Oregon #1
William H. Mullins
Imnaha Basalt, Oregon #2
William H. Mullins
Granite #2
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
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
Honeycombs, Giants Causeway, Ireland
Science Source
Pleaskin Head, Giants Causeway, 1890s
Science Source
Scoria
Andrew J. Martinez
Pumice Layers
Chris Bjornberg