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Unit 6

Changes to Earth'sSurface

What causes weathering and erosion in a river? Flowing water causes weathering and erosion.
What would you see in a landslide or mudslide? Loose rocks or mud at the bottom of a hill
Name 2 things that can cause a rock to crack. water freezing and thawing over and over plant roots growing in the cracks
How do plant roots help prevent weathering and erosion? Plant roots hold the soil in place during rain or floods.
How does wind change the shape of land? Wind can blow sand around and weather rock which changes its shape. It can also erode (move) the sand to form dunes.
How do rivers change over time? Rivers get wider and straighter as they get older.
Tell if each action is a cause or an effect. 1. Chipmunks dig holes. __________ 2. Soil is worn away. __________ 3. Plant roots grow in rocks. ___________ 4. Rocks break apart. __________ 1. cause 2. effect 3. cause 4. effect
. Tell how each item causes weathering. 1. ice 2. plant roots 3. water 1. ice expands in the crack of a rock causing it to break 2. plant roots grow in the crack of a rock and cause it to break 3. water can get into a crack and freeze and thaw over and over causing the rock to crack
Created by: Mrs. Furlong
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