Natur. tema 8

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The Earth is the only planet which has life.
Weather: state of the atmosphere at any given moment in a specific place.
Climate: state of the atmosphere over longer periods of time.
Our planet has certain characteristics which make it a suitable for originating and developing life:
Temperature is temperate.
Existence of liquid water.
Atmosphere rich in oxygen.
The other planets have very tenuous atmospheres or they are rich in toxic gases:
Mercury: no atmosphere.
Venus: carbon dioxide and very little nitrogen.
Earth:nitrogen (78%) oxygen (21%)
carbon dioxide
hydrogen, some helium
hydrogen, some helium
hydrogen, helium, methane
hydrogen, helium, methane
some methane
The life is in teh deepest ocean trenches, 10.000 metres below sea level and in the atmosphere, 10.000 metres above sea level.
The layer where organisms are located is called biosphere.
The majority of organisms are found in the layer between 3.000 metres above sea level and 2.000 metres below sea level.
There are three types of climates:
warm, temperate and cold.
The climate has a influence on teh organisms that inhabit thet area.
Warm climate: 
Equatorial,temperatures always high and constant and abundant rainfall.
Tropical: temperatures high, rainfall limited to a few months.
Desert climate: temperatures very high, very little rainfall.
Temperate climate:
Maritime: temperatures mild, plenty of rainfall all year round.
Continental: winters very cold, summers very hot and humid.
Mediterranean: winters are mild, summers are hot and dry.
Cold climates:
Are found in polar regions, high mountain summits. Polar, coldest temperatures on Earth. There is hardly any precipitation. High mountain, temperautes very low, abundant precipitation in form of snow.

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