Rock Cycle Review

4/20/2020

The Rock Cycle

• The solid parts of the Earth are made almost entirely of rock.

• Rocks are always changing, scientist study rocks to learn how areas have changed through time.

• Natural processes make and change rocks.

• These processes change each type of rock into other types of rock.

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Weathering, Erosion, and Deposition

• Weathering – the process by which water, wind, ice and changes in temperature break down rock (weathering breaks down rock into fragments called sediment)

• Erosion– the process by which sediment is moved from one place to another

• Deposition– the process by which sediment comes to rest

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Metamorphic Rock

• Rock that is buried can be squeezed by the weight (pressure) of the rock or the layers of sediment on top of it.

• As pressure increases temperature (heat) increasesand causes the rock to change into metamorphic rock.

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Magma

In some cases, the rock gets hot enough to melt and forms magma, or molten rock

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Sedimentary Rock

• Sediments are formed by weathering and erosion

• Sedimentary rock is formed by the compacting and cementing

Three classes of rocks

• Igneous rock – formed after magma cools

• Sedimentary – formed through compacting and cementing

• Metamorphic – formed through heat and pressure

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The Rock Cycle

Sedimentary Rock

Metamorphic Rock

Magma

Igneous RockSediment

1

874

3 5

6

2

9

Fill in the Blank Choices

• Log into quia and complete the fill in the blank quiz using the following choices:

• Weathering and Erosion

• Heat and Pressure

• Compacting and Cementing

• Melting

• Cooling