Troposphere - Is the nearest layer to the earth, Stratosphere - Contains the ozone layer, Mesosphere - Here is were most meteors burns up, Termosphere - Were aurora boreal is takes place, Nitrogen - 78%, Oxygen - 21%, Carbon dioxide - 0,03%, Other gases - 0,97%, The atmosphere - Has four main layers, Atmospheric pressure - Decreases when temperature increases, Water condition are variable and include - Humidity, clouds, precipitation, ground, temperature, wind, humidity - It is the concentration of water vapour in the atmosphere, Tornadoes - They start inside clouds and have an inverted cone shape, Altitude - This is the hight above sea level, Ocean currents - They can be warm when they come from topics or cold when they come from poles, Primitive atmosphere - Was made up of water vapour carbon dioxide nitrogen hydrogen ammonia and methane, Tides - Are periodic of the level of the sea due to gravitional attraction that the moon and the sun have, Bacteria - Were the first living being on earth, Normal pressure - Is the pressure at sea level, Precipitation - The water that falls to the ground,

unit 7

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