a large area of water surrounded by land and not connected to the sea except by rivers or streams
lake
a very large amount of water that covers an area that is usually dry
flood
an area, often covered with sand or rocks, where there is very little rain and not many plants
desert
a layer of gases in the sky that prevents harmful radiation from the sun from reaching the Earth
ozone layer
an area of sand or small stones near the sea
beach
a natural and continuous flow of water in a long line across a country into the sea
river
an area of lower land between two lines of hills or mountains, usually with a river flowing through it
valley
a thick layer of ice that permanently covers an area of land
ice cap
a piece of land completely surrounded by water
island
a long period of dry weather when there is not enough water for plants and animals to live
drought
to put used objects or materials through a special process so that they can be used again
recycle
a very high hill
mountain