The Earth
Rocks
More Rocks
The Rock Cycle
All Mixed Up
100
What is the outer layer of the Earth?
The crust
100
What are rocks made of?
Minerals
100
What are sedimentary rocks made of?
Sediments
100
Name two ways that sediments move.
Wind and water
100
What are the three layers of the Earth?
Crust, mantle, core
200
What is the inner most layer of the Earth?
The core
200
What type of rock has layers you can see?
Sedimentary rock
200
How are metamorphic rocks formed?
By extreme heat or pressure
200
How do rocks turn into magma?
They melt
200
How are igneous rocks formed?
Cooling lava and magma
300
What is the middle layer of the Earth?
The mantle
300
Lava and magma cool and harden to make this type of rock.
Igneous Rock
300
How are igneous rocks formed?
Melted minerals cool and harden
300
How does a sedimentary rock become a metamorphic rock?
By heat and pressure
300
How does a metamorphic rock turn into an igneous rock?
It melts from heat and pressure
400
Which layer is the hottest?
The core
400
What is erosion?
To wear away or break down
400
How are sediments formed?
Wind and water break rocks into smaller pieces
400
How do sediments become sedimentary rocks?
They get pushed together through pressure or cementing to form layers.
400
The core can be broken down into what two parts?
Inner and outer
500
Which layer is the thinnest?
The crust
500
What are the three kinds of rocks?
Igneous, sedimentary, metamorphic
500
How are sedimentary rocks formed?
By either pressure or cementing using water
500
How does an igneous rock become a sedimentary rock?
Weather makes sediments, sediments are put together
500
How long does it take for a rock to change from one type into another?
A very long time, many years
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