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Natural arch or bridge formed by erosional processes  (Photo by Judith B. Trimarchi starranchnm.com)  Iceland

Natural arch or bridge formed by erosional processes (Photo by Judith B. Trimarchi starranchnm.com) Iceland

cinder cone - a conical volcano formed by the accumulation of pyroclastic debris around a vent. (photo by Judith B. Trimarchi, 2014, Iceland)

cinder cone - a conical volcano formed by the accumulation of pyroclastic debris around a vent. (photo by Judith B. Trimarchi, 2014, Iceland)

hoodoo - a column or pillar of rock produced by differential weathering in a region of sporadic heavy rainfall, commonly facilitated by joints and by rock layers of varying hardness. (Photo by Judith B. Trimarchi starranchnm.com)  Bryce Canyon, AZ 2007

hoodoo - a column or pillar of rock produced by differential weathering in a region of sporadic heavy rainfall, commonly facilitated by joints and by rock layers of varying hardness. (Photo by Judith B. Trimarchi starranchnm.com) Bryce Canyon, AZ 2007

volcanic crater- steep-walled, usually conical depression at the summit or on the flanks of a volcano, resulting from the explosive ejection of material from a vent. (Photo by Judith B. Trimarchi, Iceland, 2014, starranchnm.com)

volcanic crater- steep-walled, usually conical depression at the summit or on the flanks of a volcano, resulting from the explosive ejection of material from a vent. (Photo by Judith B. Trimarchi, Iceland, 2014, starranchnm.com)

columnar jointing - the type of jointing that breaks rock, typically basalt, into columnar prisms. Usually the joints form a more or less distinct hexagonal pattern. These particular basalt columns were ground down by glaciers. (Photo by Judith B. Trimarchi, 2014, Iceland, starranchnm.com)

columnar jointing - the type of jointing that breaks rock, typically basalt, into columnar prisms. Usually the joints form a more or less distinct hexagonal pattern. These particular basalt columns were ground down by glaciers. (Photo by Judith B. Trimarchi, 2014, Iceland, starranchnm.com)

hanging valley - a valley whose mouth is high above the floor of the main valley to which it is tributary. Usually, but not always, the result of mountain glaciation.  (In this photo, the hanging valley is caused by the separation of the continental plates. Iceland, 2015)  (Photo by Judith B. Trimarchi starranchnm.com)

hanging valley - a valley whose mouth is high above the floor of the main valley to which it is tributary. Usually, but not always, the result of mountain glaciation. (In this photo, the hanging valley is caused by the separation of the continental plates. Iceland, 2015) (Photo by Judith B. Trimarchi starranchnm.com)

calving - the breaking away of ice from the front of the glacier when it ends in a lake or an ocean. Produces icebergs.  (Photo by Judith B. Trimarchi, 2008, Hubbard Glacier, Alaska, US.)

calving - the breaking away of ice from the front of the glacier when it ends in a lake or an ocean. Produces icebergs. (Photo by Judith B. Trimarchi, 2008, Hubbard Glacier, Alaska, US.)

folded radiolarian chert What's beneath your grass-covered hills? by cocoi_m, via Flickr

folded radiolarian chert What's beneath your grass-covered hills? by cocoi_m, via Flickr

Amazing Geologist ⚒ How to Identify Active Faults |#Geology *Photo : © Pierre Thomas visit : http://www.geologyin.com/

Amazing Geologist ⚒ How to Identify Active Faults |#Geology *Photo : © Pierre Thomas visit : http://www.geologyin.com/

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