Geologic Time Scale Test

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What is the Geologic Time Scale?

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A system of chronological dating that relates geological strata to time, used by geologists and other Earth scientists to describe the timing and relationships of events in Earth's history.

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What does it mean when we say a rock layer is 'younger' than another?

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It means that the rock layer was formed after the other layer, based on the principle of superposition.

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What is a fossil?

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Preserved remains or traces of ancient organisms, typically found in sedimentary rocks.

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What is relative age dating?

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A method of determining the age of a rock or fossil in relation to other rocks or fossils.

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What is an intrusion in geology?

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A body of igneous rock that has formed from magma that has cooled and solidified beneath the Earth's surface.

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What is an extrusion in geology?

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Lava that has erupted onto the Earth's surface, solidifying into rock.

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What is the principle of superposition?

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In an undeformed sequence of sedimentary rocks, the oldest layers are at the bottom and the youngest layers are at the top.

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What is an unconformity?

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A surface of contact between two groups of unconformable strata, indicating a gap in the geological record.

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What is the significance of fossils in understanding Earth's history?

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Fossils provide evidence of past life and can help determine the relative ages of rock layers.

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What is radiometric dating?

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A technique used to date materials by comparing the abundance of a radioactive isotope to its decay products.