Water resources and deserts

The Earth’s water is gathered in oceans, seas, rivers, lakes, glaciers and underground. Some is in the atmosphere as vapour and cloud, and there is water inside living things. Natural bodies of water: ocean, sea, river, lake, marsh. Artificial ones: pond, reservoir, canal. A river often starts in the mountains and flows into a sea, a lake or another river. Most of the Earth’s water is salty (oceans and seas); we cannot drink it because it has too much salt. Fresh water is much scarcer, so we must save it: turn off the tap while brushing teeth, shower rather than fill a bath, and fix dripping taps. Drinking water should be boiled because raw water may contain harmful bacteria.