Presentation on theme: "Wearing Down and Building Up"— Presentation transcript:
1 Wearing Down and Building Up Changes in the Earth’s SurfaceBy Holly Connor
2 Does the surface of the Earth change? Yes!-The Earth’s surface isalways changing.-Some changes are slow.-Some changes are sudden.
3 Weathering…A Gradual Wearing Down -Weathering is the breaking up or wearing away of rocks.-It is caused by water or strong winds.-Erosion is the breaking up and moving of weathered rocks from one place to another.
4 Glaciers…A Slow Moving Mass -A glacier is a large mass of slow moving ice.-As it moves and melts it changes the surface beneath it.-It can pick up and move large rocks and the soil beneath it.-This is another form of erosion.
5 Volcanoes…A Sudden Blast -In some parts of the world, magma is close to the surface.-If it shoots out of the ground it is called a volcano.-Liquid rock, called lava, burns everything in its path. When it cools it adds a layer of rock to the Earth’s surface.
6 Earthquakes…A Quick Shake Up -An earthquake is a sudden movement of large sections of rock beneath Earth’s surface.-Hills and boulders can appear or disappear suddenly.-Sections of the ground may drop or crack.
7 Show What You Know! What causes weathering? How do glaciers cause erosion?How does lava change the Earth’s surface?What is an earthquake?
8 Works CitedBadders, William, Bethel, Lowell J., Fu, Victoria, Peck, Donald, Sumners, Carolyn, Valentino, Catherine. “How Do the Forces of Nature Change Earth’s Surface?” Discovery Works, Houghton Mifflin, Volume 1, 2000.