TCI Unit 3 Lesson 3 4th grade

Sand is made up of

• powdered clay.

• weathered bits of rock

• dried out soil.

• crushed animal bones.

Hills called sand dunes form when

• the roots of plants hold sand in one place.

• water deposits in valleys.

• wind deposits sand in one place.

• burrowing animals dig holes.

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Which of these is an example of how wind erosion can cause a problem for humans?

• It can carve deep canyons.

• It can crack large rocks in two.

• It can cut a hole in a cliff to form an arch.

• It can blow away the top layer of soil during a drought.

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What is one benefit of a windbreak?

• It can prevent a dust storm.

• It helps create sand dunes.

• It makes winds much weaker.

• It can prevent plants from drying out.

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A sandblaster is a machine that shoots sand at a surface to clean it. Why is sand useful when cleaning machines and buildings?

• It is as slippery as clay because it is made of clay.

• It is as hard as rock because it is made of bits of rock.

• It can hold water like soil because it is made of soil.

• It has the odor of bones because it is made of crushed animal bones.

What an interesting rock sculpture! A human artist did not carve it, though. How did wind make the shape you see in this desert?

• It deposited soil to make this shape.

• It deposited sand to make this shape.

• It blew sand against the rock and weathered it.

• It blew water against the rock and weathered it.

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The photo shows a windbreak along a farmer’s field. What is one benefit to farmers of this windbreak?

• It can prevent plants from drying out.

• It can let more sun reach the plants.

• It can prevent animals from entering the field.

• It can let more water reach the plants.

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Which effect of wind erosion causes problems for humans?

• It can blow away the dry top layer of soil during a drought.

• It can carve rocks into the shape of arches in a desert.

• It can pile up sand to form sand dunes along a beach.

• It can move sand dunes one grain at a time along a beach.

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These tracks are evidence that a bear walked on this dune just hours ago. The photographer will return in a day. How will the tracks look then and why?

• The tracks will still be there because the sand in sand dunes hardly moves at all.

• The tracks will still be there because the sand will harden and form solid rock.

• The tracks will have disappeared because the wind moves and deposits sand to fill them in.

• The tracks will have disappeared because the wind will weather rock and the new sand will fill them in.

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Your school plans to hold a kite-flying contest. Kites need a steady wind to fly well. Where on the school grounds should the contest be held?

• lose to fences, trees, and buildings

• close to fences, but far from trees and buildings

• close to buildings, but far from fences and trees

• far away from fences, trees, and buildings

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