Chapter 6

Weather and precipitation

6.1 Guidance

6.1.1 What is weather and precipitation?

Water is one of the most remarkable substances on the Earth. It is the substance that we most often see in all its three states: liquid (water), solid (ice) and gas (steam). No living organism can exist without water and as much as half the weight of plants and animals is made up of water. Water in the oceans makes up approximately 11 times the volume of the solid part of the Earth, in addition, that is, to water frozen in ice floes, in lakes, rivers, within the ground and in living plants and animals.

Water is a constantly moving cycle. As the sun beats down, some of the surface water is evaporated; this water vapour rises as part of the air and is moved ...

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