desert, an area, often covered with sand or rocks, where there is very little rain and not many plants, forest, a large area of land covered with trees and plants, usually larger than a wood, or the trees and plants themselves, lake, a large area of water surrounded by land and not connected to the sea except by rivers or streams, river, a natural wide flow of fresh water across the land into the sea, a lake, or another river, ocean, a huge area of salty water that covers most of our planet and is bigger than a sea, valley, an area of low land between hills or mountains, often with a river running through it, volcano, a mountain with a large, circular hole at the top through which lava, glacier, a large mass of ice that moves slowly

The changing planet

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