landform - a part of the Earth's surface with a unique shape, sediment - rocks, pebbles, sand carried by water, wind, and ice, deposition - dropping of sediment in a new location, erosion - gravity, water, ice move sediment from one place to another, weathering - breaking down of rock over time by natural elements, chemical weathering - process when chemicals break down rocks and cause cracks and holes, physical weathering - process when rocks and minerals are broken down by a force such as machines or tools, cataclysmic event - an event such as a tornado or hurricane that causes a sudden change to the Earth's surface, biological weathering - break down of rock by humans, plants, or animals, gravity - force of our planet that pulls things down toward the center of the Earch, mechanical weathering - also known as physical weathering,

Earth's Changing Surface

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