Science Quiz / 'I' in Geology

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Can you name the answers to these Geology questions where all of the answers begin with 'I'?

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LettersinGeologyI
Score 0/16 Timer 12:00
QuestionAnswer
This ancient ocean disappeared early in the formation of Pangaea (about 400 million years ago)
Refers to igneous rocks with 52-63% silica content and a mix of mafic and felsic minerals
This narrow feature formed 12-15 million years ago between the Americas, separating the Pacific and Atlantic
The material deposited by a pyroclastic flow; often includes flattened pieces of pumice
Class of Arthropod with three-part bodies and chitinous exoskeletons first appearing in the Devonian (#3 above)
The formal name for the primarily iron-nickel solid ball thought to be at the center of the Earth
Refers to coarse-grained crystalline rocks that form from slowly cooling sub-surface magma
The collision of this plate with the Eurasian Plate is currently forming the Himalayas
Gem-quality cordierite; it's name comes from the Greek for 'violet' (#1 above)
A fossil used for dating and correlating the strata in which it's found (e.g., conodonts and mucrospurifers)
A roughly circular depression formed by the violent collision of a smaller object with Earth's surface (#2 above)
A rock formed by the crystallization or solidification of molten material
A stream that recharges groundwater because its channel lies above the water table
By mass, the most abundant element on Earth
The movement of surface water downwards into porous soil
This dark grey, weakly magnetic oxide is the Earth's most important titanium ore (#4 above)

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