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.
This Photo by Unknown author is licensed under CC BY-SA.
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
This Photo by Unknown author is licensed under CC BY-SA.
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.
This Photo by Unknown author is licensed under CC BY-NC.
Magma
In some cases, the rock gets hot enough to melt and forms magma, or molten rock
This Photo by Unknown author is licensed under CC BY.
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
This Photo by Unknown author is licensed under CC BY-SA.
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