Age of Earth

What is sedimentary rock?

• A rock that forms from compressed or cemented layers of sediment

• A piece of sediment

• Rock that forms from lava or magma

• A rock that changes type

What are fossils?

• The remains of animals and plants that have died

• The remains that have been perfectly preserved

• The preserved remains or traces of organisms that once lived on Earth

• I need a refresher

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NGSS.MS-LS4-1

What type of rocks can you find fossils?

• Igneous

• Metamorphic

• Sedimentary

• All types

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What causes sedimentary rock to form?

• Cement

• Fracturing

• Cohesion

• Erosion

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Determining the age of a fossil by comparing its placement with other fossils in other layers of rock is an example of which type of dating?

• Relative

• Absolute

• Intermediate

• Correlative

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In a sample of rock layers, the layers at the bottom will _____ than the rocks above it.

• Younger

• Same age

• Older

• I don't know

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NGSS.MS-ESS1-4

What are index fossils?

• Fossils that have been discovered already

• Fossils that are very common

• fossils that can tell us the exact age of a rock

• fossils that are used to establish and compare the relative ages of rock layers

What is the rock record

• A vinyl with rock

• information provided by rocks about Earth's history

• information about past organisms

• all the rocks on Earth

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NGSS.MS-ESS1-4

Unconformities are breaks in the geologic record that are caused by _______.

• erosion causing sediment to build up.

• I don't know

• sediment compacting and cementing

• eroded layers or sediment not deposited

What is absolute dating?

• A technique used to figure out an estimate for the age of a rock or fossil

• A technique used to make a rock appear older

• A technique used to determine the actual age of a fossil

• I don't know