The Rock Cycle Flashcards by Annabel Seigler | Brainscape

Q

Largest period of time

A

Eons

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Q

Amount of eons

A

4

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Q

Current eon

A

Phanerozoic

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Q

Second longest unit of time

A

Era

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Q

How many eras are there?

A

3

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Q

What era are we in?

A

Cenozoic

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Q

How long has the cenozoic era been?

A

66million years

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Q

What do eras reflect?

A

Noticiable changes in the Earths fossil record.

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Q

Second shortest period of time

A

Periods

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Q

What do periods show?

A

When a single type of rock was formed

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Q

Smallest unit

A

Epoch

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Q

What epoch are we in?

A

Holocene/anthropocene

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Q

What are the three types of rock

A

Igneous, metamorphic, and sedimentary

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Q

How is igneous rock formed?

A

When rocks melt into magma and then cool.

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Q

How are sedimentary rocks formed?

A

When rocks are weathered and eroded into sediment and compressed by layers of sand.

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Q

How are metamorphic rocks formed?

A

When rocks are transformed by heat or pressure

Q

What are examples of igneous rock?

A

Granite

Q

What is an example of a sedimentary rock?

A

Sandstone or limestone

Q

What is an example of a metamorphic rock?

A

Marble

Q

Where are igneous rocks found?

A

Mountains and continental outcrops

Q

Where are sedimentary rocks found?

A

Oceans, deserts, and lakes.

Q

Where are metamorphic rocks found?

A

Underground, in quarries.