Introduction

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Have you ever thought about the landforms above us, below us, and around us?  We have mountains, hills, rivers, canyons, and glaciers to name a few that fill our country and world.  Maybe you have sledded down a hill or glided through a river.  What do these images bring to mind when you look at or think about them? 

Will these magnificent land formations still look like this ten years from now?  How about twenty or even thirty years from now? 

Studies have shown that these surfaces will change over time.  How does that change occur?  And how do humans impact the earth's many different surfaces?