Science / Geology / Basic Rock: An igneous rock that has a relatively low silica content. Examples are gabbro and basalt. Also see entries for acidic, intermediate and ultrabasic rocks.
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Basic Adjective Synonyms: fundamental, essential, key, elementary, underlying, prime, primary, root, principal, central, focal, vital
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Rock Noun Synonyms: stone, boulder
Rock Adjective Synonyms: crag, tor, escarpment, scarp, outcrop, outcropping
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Science / Geology / Intermediate Rock: An igneous rock that has an intermediate silica content. Examples are syenite and diorite. Also see entries for acidic, basic and ultrabasic rocks. MORE
Science / Geology / Acidic Rock: An igneous rock that has a relatively high silica content. Examples are granite and rhyolite. Also see entries for basic, intermediate and ultrabasic rocks. MORE
Science / Geology / Rock Salt: A chemical sedimentary rock that forms from the evaporation of ocean or saline lake waters. It is also known by the mineral name 'halite'. It is rarely found at Earth's surface, except in areas of ver MORE
Science / Geology / Rock Flour: A glacial sediment of extremely fine (silt-and clay-size) ground rock formed by abrasion of rocks at the base of the glacier. MORE
Science / Geology / Rock Glacier: A mass of rock material, cemented together by ice, that flows down a slope under the force of gravity much like the motion of a glacier. MORE