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Look at the following pictures of landforms. In the margin of your paper, explain how you think those landforms were made. Look at the following pictures of landforms. In the margin of your paper, explain how you think those landforms were made. Share with your partner. The slow process that breaks rocks into smaller pieces is called weathering. A rock is broken apart by physical weathering if the rock type does not change. If a rock contains iron, air and water can react with the iron through chemical weathering and form rust. The weathering and removal of rock from one place to another is called erosion. Erosion can be caused by glaciers, wind, moving water, and gravity. When the Colorado River eroded the land around the river in Arizona, the Grand Canyon was formed. Glaciers form in very cold places as thick sheets of ice. As the weight of the overlying ice increases, the glacier begins to flow. Deposits left behind by a glacier are called glacial debris and glacial till. The mounds that form where till builds up are called moraines. Most processes change land slowly, but people can make faster changes. People change the land by mining it to get minerals, metals, or fuels. Flowing water changes the land more because frozen water only forms in cold places 3- List three facts you learned today. 2- List two questions you have about what you learned today. 1- List the one thing you found the most interesting.