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a huge, moving mass of ice


wearing away of the Earth's surface by water, or wind


a flat, sandy area where a river enters an ocean


a flat landform


a high, flat landform

map projection

a way to draw the curved areas of the Earth on a flat surface


related to regions near the equator; a tropical climate is very warm and moist

fossil fuel

coal, oil, or natural gas that formed over millions of years from the remains of plants and tiny animals

renewable resource

a resource that can be replaced as it is used

nonrenewable resource

a resource that cannot be replaced by natural resources or is replaced extremely slowly

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