True or False: Valleys and canyons are not landforms.
False! Valleys and canyons are landforms.
100
What is weathering?
Weathering is when Earth's crust are slowly broken into smaller pieces.
100
What is erosion?
Erosion is the process of weathered materials being moved from one place to another.
100
How does gravity cause erosion?
Gravity pulls all objects from higher places down to lower places. It causes loose, weathered material to roll downhill.
100
Where do volcanoes form?
Volcanoes form at weak spots in Earth's crust where magma is forced upward and reaches the surface.
200
True or False: Mountains can take millions of years to form.
True!
200
What are two types of weathering?
The two types of weathering are physical weathering and chemical weathering.
200
How are erosion and weathering different?
Erosion is the movement of rock, and weathering is the breaking down of rock into smaller pieces.
200
What is a landslide?
A landslide is the rapid downhill movement of a large amount of rock and soil.
200
How are volcanoes usually shaped?
They are usually cone-shaped.
300
What is the outer surface of the earth known as?
The outer surface of the earth is known as the crust.
300
What is physical weathering?
Physical weathering is when only the size of the rocks is changed. Large rocks are broken down into smaller rocks of the same kind.
300
What is deposition?
Deposition is the process of laying down, or building up, pieces of the Earth's surface.
300
What is an avalanche?
An avalanche is the name for large amounts of snow and ice that fall rapidly down a mountain.
300
How does an earthquake occur?
When the plates of Earth's crust move along a fault (break or crack), sometimes they get stuck. Since the plates continue to move, sometimes the pressure becomes too great, and they move suddenly. The sudden movement that causes Earth's crust to shake is an earthquake.
400
How do mountains form?
Mountains form when the plates of Earth's crust rub & push against each other, causing them to push upwards, forming mountains.
400
What is chemical weathering?
Chemical weathering is when chemicals cause the rocks to change into different types of material. The new material can break into smaller pieces.
400
Explain how deposition can happen by wind?
Wind can carry pieces of sand or particles, and can deposit them on top of the soil. In deserts, wind carries grains of sand from one place to another, and builds up mounds called sand dunes.
400
What can trigger an avalanche?
Strong winds, earthquakes, and explosions can trigger avalanches.
400
What is an epicenter?
An epicenter is the point on Earth's surface that is directly above the focus, or beginning, of an earthquake.
500
Name all the landforms mentioned on pages 262-263.
Water carries particles of rock, soil, and sand. The particles scrape against each other, and they gradually become smaller and smaller.
500
What are 4 ways erosion happens?
Erosion can happen by moving water, ice, wind, and gravity.
500
What is one way people try to control erosion and deposition?
People can: grow plants on hills; famers can plow hilly fields into steps called terraces; build barriers along the seashore to stop large waves from carrying sand away from a beach; dig deposited material out of waterways to ships can pass.
500
How can a volcano affect an area's climate?
When huge amounts of ash and gases form in the sky, it can block the sunlight that reaches Earth. Temperatures would be cooler.