Science Quiz / 'I' in Geology

Random Science or Geology Quiz

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

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

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