The earth’s features are constantly changing, some of these changes are immediate and some are not immediate. Wind and water erode away mountains and hills. Ice and heat break apart rocks. Rivers cut new valleys and dams form new lakes. Volcanoes and earth form new mountains and hills. Wind and water combine to build sand dunes and then turn around and erode them away. There are many different types of features on earth's surface due to the complexity of our planet. The surface is unique from the other planets because it is the only one which has liquids water in such large quantities. Thus water forms rivers, oceans, beaches and lakes. Mountains, earthquakes and volcanoes, are formed when large pieces of the earth's outer layer move slowly by plate tectonics.
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