Unit 2 review

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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 to describe the timing and relationships of events in Earth's history.

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What is an Intrusion in geology?

Back

A body of igneous rock that has formed from magma that has cooled and solidified within the crust of the Earth.

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What is a Fault in geological terms?

Back

A fracture or zone of fractures between two blocks of rock, which can cause earthquakes.

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What is an Angular Unconformity?

Back

A type of unconformity where younger sedimentary rocks are deposited on top of older, tilted, or folded rocks.

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What is a Disconformity?

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A type of unconformity where layers of sedimentary rock are parallel but there is a gap in the geological record.

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What are Glacial Deposits?

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Sediments that have been transported and deposited by glacial ice, often consisting of a mix of different sized particles.

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What is the significance of Half-Life in radioactive decay?

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The time required for half of the radioactive atoms in a sample to decay, used to date materials and understand decay processes.

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What is Iodine-131 used for?

Back

A radioactive isotope commonly used in medical diagnostics and treatment, particularly for thyroid conditions.

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What is the principle of Superposition in geology?

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

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What is the Law of Original Horizontality?

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The principle that layers of sediment are originally deposited horizontally under the action of gravity.