Erosion Rourke Media Educational Shirley Duke rourkeeducationalmedia com Scan for Related Titles and Teacher Resources
CHAPTER ONE What Is Erosion If you visit any national park in the U S you could see great canyons towering pinnacles or a cave deep below the Earth’s surface Many of these formations came from soil deposited in layers and cut through by water Others formed as water wind and ice moved over or through rock endlessly changing it Moving water created the cliffs of Bryce Canyon and wore away the rock of Niagara Falls Mammoth Cave grew as rainwater combined with carbon dioxide slowly dissolved the rock Mammoth Cave in Kentucky is a huge cave system with over 400 miles 644 kilometers explored 4
Niagara Falls has eroded so much rock that the falls are now seven miles 11 2 kilometers from their original location After a flood rapid changes become visible in the surrounding land Soil and pebbles wash away and tumble along the river bottom Mud deposits cover the topsoil Erosion moves the materials that form the earth from one place to another This process creates changes that shape the earth 5
