EQ How do humans add to the erosion

EQ: How do humans add to the erosion process?

How do humans add to the erosion process ? 1. What are natural and non natural ( human) agents of erosion ? 2. How can logging and mining lead to erosion? 3. How can farming lead to erosion 4. How can construction lead to erosion ?

Human Activity and Erosion Natural agents of erosion: – Wind – Moving water – Gravity (landslides) – Waves – Glaciers (rivers of ice) Humans add to the erosion process: – Logging – Mining – Farming – Construction

Logging • (C) People use trees to build homes, make furniture and paper. • In a method called clearcutting, all the trees in an area are cut down. • (E) Roots that used to hold the soil in place die and decay. • (E) Rain washes the soil away. • Soil has been robbed of nutrients and minerals needed for plants to grow.

Mining • (C) To get useful, valuable minerals from the ground, miners strip away the surface of the land. • Strip-mining and open-pit mining remove plants from an area. • (E) Plants prevent soil erosion by flowing waters and wind. • (E) Without plants, erosion speeds up. • Thousands of years may pass before enough topsoil builds up to support plant life.

Farming • (C) Humans plant crops for food and to make a living. • (E) Planting crops and an unexpected natural event can produce a disaster. • (E) From 1930 to 1937, a drought struck the mid-western part of the U. S. • (S) Grasses could have protected the soil during the drought. • Winds picked up the topsoil and blew it 100 s of miles eastward. • This event is known as the “Dust Bowl. ”

Construction • (C) Population growth is the cause of the building of roads, buildings, and communities. • (E) This removes natural barriers such as plants. Erosion speeds up and the land becomes barren and ugly. • (S) Today, city officials consider erosion when they construct new plans.

Quick Check What is MAINLY responsible for preventing erosion? A. B. C. D. mining farming rooting of plants logging

Quick Check Which human activity is related to logging? A. B. C. D. strip mining clear-cutting drought open-pit mining

Quick Check A landslide is an example of A. B. C. D. erosion a mining process A logging process A farming process

Quick Check In what part of the United States was the “Dust Bowl” located? A. B. C. D. northern eastern western central

Quick Check What was the MAIN cause of the “Dust Bowl”? A. floods B. Storms C. wind D. drought