![]() ![]() Water, wind, ice, and gravity are important forces of erosion. This scene is within the East African Rift where the crust is being pulled apart to form a large valley. The destructive forces of weathering and erosion modify landforms. Volcanic eruptions can also be destructive forces that blow landforms apart. Sediments are deposited to form landforms, such as deltas. Mountains rise when continents collide, when one slab of ocean crust plunges beneath another or a slab of continental crust to create a chain of volcanoes. Crustal deformation-when crust compresses, pulls apart, or slides past other crust-results in hills, valleys, and other landforms. Constructive forces cause physical features on Earth’s surface known as landforms to grow. The oldest continental rocks are billions of years old, so the continents have had a lot of time for things to happen to them. The ocean basins extend from the edges of the continents down steep slopes to the ocean floor and into deep trenches.The continents are large land areas extending from high mountaintops to sea level.The slow processes of mechanical and chemical weathering and erosion work over time to change once high mountains into smooth flat plateaus. The eruption of a new volcano creates a new landform. Constructive forces cause landforms to grow. Earth’s surface features are the result of constructive and destructive forces.
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