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Science Chapter 6 Lesson 2
Geology-The Earth’s Changing Crust
What is the outermost layer of the Earth?
The crust
Which layer is solid but can flow like putty?
The mantle
The innermost layers are composed mostly of what two things?
Iron and nickel
Which layer is thin, hard layer?
The crust
Which layer is the thickest?
The mantle
The _____________ is a rocky layer.
Crust
Give three examples of physical weathering.
Water, wind, and temperature changes
Explain chemical weathering.
Chemical weathering occurs when gases in the air break down rocks.
What is erosion?
It is when pieces of weathered rock being carried away by gravity, water, wind, and ice.
What are plates?
Pieces of the Earth’s crust that move
How are plates formed?
Rock material from the mantel pushes up on the crust
Plates that move together are _______________ boundaries.
Convergent or compression
Plates that move apart are _______________ boundaries.
Divergent or tension
The Earth is always ________________ and always ________________.
Moving, changing
Without _______ and ________, there can be very little weathering and erosion.
Air, water
What is magma?
Hot molten rock deep below the Earth’s surface
What is lava?
Magma that reaches the surface
What do you call a scientist who studies the Earth?
A geologist
What is a fault?
A crack in the Earth’s surface
What is a meteorite?
A rock from space
What is it called when pieces of eroded rock are dropped off?
Deposition
How does weathering and erosion occur on the moon?
Space rocks hit the surface