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64 Cards in this Set

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Q.Define erosion
Erosion is the wearing down and moving of rocks and soil from one place to another.
Q. What does erosion begin with?
weathering
Q. Weathering is the --- of rocks and soil on Earth's surface.
breaking up
Q. Trees and other plants protect the soil from ---.
erosion
Q.
As rock becomes exposed on the surface, it is slowly broken into --- by wind, rain, and ice.
smaller pieces
Q.
At times, landslides, mudslides, or --- cause erosion to happen very quickly.
storms
Q.
Define weathering.
breaking up of rocks and soil
Q.

Moving water can cause ---.
erosion
Q.
Rain causes --- of rocks and soil.
weathering
Q.
Define run-off
Run-off carries loosened soil into rivers.
Q.
Flowing water may cut away the banks of a ---.
river
Q.
The water in oceans is always ---.
moving
Q.
Some rocks, like limestone, may break down or --- in water.
dissolve
Q.
Flowing water may --- down the riverbed and make a V-shaped canyon.
break
Q.
Ocean waves can deposit sand and soil to make --- and sandy beaches.
sandbars
Q.
Often the water in the middle of rivers flows ---.
slowly
Q.
Water that flows in rivers moves rocks and soil --.
downhill
Q.
What that flows across the ground is called ---.
run-off
Q.
What makes steep cliffs by the ocean?
ocean waves
Q.
What cuts away the banks of a river?
the flowing water of the river
Define a sandbar.
deposits made by waves
Q.
What formed the Mississippi River Delta?
The Mississippi River Delta was made by deposits made by waves.
Q.
When water freezes, it take up --- space.
more
Q.
Frost makes the cracks of a rock get ---.
bigger
Q.
Hailstones --- at the ground and loosen soil.
pound
Q. Glaciers are so --- that they press down very hard on the land.
big and heavy
Q.
Glaciers cut out --- valleys.
U-shaped
Q.
Define frost.
frozen dew
Q.
Define glacier.
large sheet of slow-moving ice
Q.
Define hailstone.
hard, round pieces of ice
Q.
Winds can blow so hard and fast that they can damage buildings and push over large ---.
trees
Q. As wind blows, the rock and soil particles --- against exposed rock.
hit
Q.
In a hurricane, pounding ocean waves can --- beaches.
destroy
Q.
Strong winds and heavy rain may form a --- over the ocean.
hurricane
Q.
Together wind and rain can loosen and move --- soil than they can separately.
more
Q.
When snowdrifts melt, the flowing water can move the rocks and soil, causing --- and flooding.
erosion
Q.
Bits of broken rock mix with air, water, and --- to form soil.
humus
Q.
Define humus.
Humus is the remains of dead plants and animals.
Q.
Soil forms ---.
slowly
Q.
Solid rock called --- is under the layers of soil.
bedrock
Q.
What are the two top layers are soil called?
1. topsoil
2. subsoil
Q.
Woil often has --- layers.
two
Q.
Erosion from wind and --- carry away tons of soil each year.
water
Q.
Three hundred years ago, --- of the United States was covered by forests.
one half
Q.
Rapid run-off causes ---.
flooding
Q.
Most forest fires are started by ---.
people
Q.
The --- of Earth is always being worn away by water.
surface
Q.
The breaking up of rocks and soil on EArth's surface is caused by ---.
weathering
Q.
Large, slow-moving sheets of ice make up a ---.
glacier
Q.
Rainwater that flows across the ground is called ---.
run-off
Q.
STrong winds and heavy rain that form over the ocan are called ---.
hurricanes
Q.
Tiny bits of broken rock mix with air, water, and --- to form soil.
humus
Q.
Define topsoil.
often the richest layer of soil
Q.
Define frost.
frozen dew
Q.
Define sandbar.
deposit of sand near the shore
Q.
Moving water wears away land and moves rocks and soil ---.
downhill
Q.
Frost helps break up rocks by pushing against the ---.
cracks
Q.
Rocks land soil blown by the wind can ---
wear away rock
Q.
Each kind of rock makes a certain type of ---.
soil
Q.
People help cause weathering and erosion by ---.
clearing the land
Q.
Glaciers are large, slow-moving sheets of ---.
ice
Q.
Erosion is the --- of rocks and soil.
moving
Q.
Weathering is the --- of rocks and soil.
breaking up
Q.
What cuases most weathering and erosion on Earth?
Most weathering and erosion on Earth is caused by moving water.