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Rapid Changes Third Grade Science 2013 Name three causes for RAPID (fast) landform changes. 1. Earthquakes 2. Volcanoes 3. Floods Name the layers of the Earth from inside, out. 1. Inner core 2. Outer core 3. Mantle 4. Crust What layers of the earth’s surface are made up of many different pieces that fit together like a puzzle? 1. Crust 2. Mantle What causes earthquakes? When the crust and mantle pull away and push into each other. This causes a shaking of the Earth’s surface called an earthquake. What is a volcano? A volcano is an opening in the Earth’s surface from which lava flows. An eruption of a volcano can blow off a mountain top, cause liquid rock to build up new mountains and sometimes burn nearby forests and buildings. What is a flood? A large amount of water that covers land which is normally dry. Floods often occur where heavy rains cause rivers to fill and overflow their banks into low lying areas. How do floods change the land? Flood waters leave rich soil and sand behind, which can be good for crops. Floods damage buildings, roads.