1. Chapter 12
Section 1 Shoreline Erosion and Deposition
Bellringer
Where does sand come from? Many people find the sound of waves on a beach very relaxing and peaceful. However, each wave that comes ashore carries a certain amount of destructive force.
Write a short poem about how ocean waves create sand from rock.

2. Erosion
What Is Erosion? Erosion is the process by which soil and sediment are transported from one location to another.

3. Chapter 12
Section 1 Shoreline Erosion and Deposition
Wave Erosion
When waves crash into rocks over long periods of time, the rocks are broken down into smaller and smaller pieces until they become sand.
Wave Erosion - Waves usually play a major role in building up and breaking down the shoreline.
A shoreline is the boundary between land and a body of water.

4. Wave Erosion, continued
Chapter 12
Section 1 Shoreline Erosion and Deposition
Wave Erosion, continued
As the wind moves across the ocean surface, it produces ripples called waves.
Example: The wind that results from summer hurricanes and severe winter storms produces large waves that cause dramatic shoreline erosion.

5. Chapter 12
Section 2 Wind Erosion and Deposition
Wind Erosion
Wind Erosion is the skipping, bouncing, and movement of sand or other sediments, caused by wind.
Moving sand grains knock into one another, bounce up into the air, fall forward, and strike other sand grains, causing them to roll and bounce forward.

6. Erosion Due to Glaciers
Chapter 12
Section 3 Erosion and Deposition by Ice
Erosion Due to Glaciers
A glacier is a large mass of moving ice. They are capable of eroding, moving, and depositing large amounts of rock materials.
Glaciers form in areas so cold that snow stays on the ground year-round. Because glaciers are so massive, the pull of gravity causes them to flow slowly, like “rivers of ice.”

7. Erosion Due to Glaciers
Chapter 12
Section 3 Erosion and Deposition by Ice
Erosion Due to Glaciers
Glacier movement is affected by climate. As the Earth cools, glaciers grow. About 10,000 years ago, a continental glacier covered most of North America.

8. Erosion Due to Gravity Chapter 12
Section 4 The Effect of Gravity on Erosion and Deposition
Chapter 12
Erosion Due to Gravity
Gravity is an agent of erosion and deposition. It influences the movement of water and ice, and it causes rocks and soil to move downslope.
Mass movement is the movement of any material, such as rock, soil, or snow, downslope.

9. End of Chapter 12