10-22 Analyze the picture below. Identify what type of weathering occurred, and tell me what evidence you have to support your claim.

What happens to the sediment after weathering?

Erosion

Erosion- the transportation of sediment. (carrying away of sediment) Agents of erosion include wind, water and ice. Striations-lines left behind showing evidence of movement.

Water Erosion Heavy Rainfall/flooding

Waves moving sand

Wind Erosion Dust storms in dry/arid climates

Ice Erosion Glaciers carry away sediment as they move

Problems Caused by Erosion Soil Erosion- When agriculture fields replace natural vegetation, topsoil is exposed and can dry out. The diversity and quantity of microorganisms that help to keep the soil fertile can decrease, and nutrients may wash out. Soil can be blown away by the winds or washed away by rains. https://www.youtube.com/watch?v=V5XznHQigiE

Beach Erosion- U.S. Environmental Protection Agency estimates that between 80 and 90 percent of the sandy beaches along America’s coastlines have been eroding for decades. In many of these cases, individual beaches may be losing only a few inches per year, but in some cases the problem is much worse. The outer coast of Louisiana is losing some 50 feet of beach every year. -Stephen Leatherman, National Healthy Beaches Campaign https://www.youtube.com/watch?v=Hw6sDulj7GA

So, What can we do? You can’t stop erosion, but we have found ways to slow it down. https://www.youtube.com/watch?v=LpltrgkLqWc

Ways to slow down Soil Erosion Using chemicals that help hold the soil together.

Improving drainage, diverting water away from problem areas.

Using geotextile fabrics to help hold soil in place.

Building retaining walls or terraces

Planting plants on a hillside, the roots hold the soil in place.

Slowing Beach Erosion Jetties/Groins

Galveston Island Seawall

Review Draw a picture of erosion What are the 3 agents of erosion?