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1、The Biosphere, atmosphere, hydrosphere and lithosphere,Earth,Roughly 4.5 billion years old Third planet orbiting around the sun Only planet in our solar system to have surface liquid water Home to the only known life in the universe,Internal Structure of Earth,Biosphere,Regions in which life can exi
2、stMade up of 3 parts Atmosphere (air) Hydrosphere (water) Lithosphere (rock and sediments),Atmosphere,The gases that envelope and surround the Earth make up our atmosphere Protects us from UV rays Balances the global temperature on the Earth Made up of various gases (Nitrogen, oxygen, water vapour,
3、Carbon dioxide, Ozone, etc.),Layers of the atmosphere,Troposphere : contains 80% of all airStratosphere: absorbs UV raysMesosphere: Protects Earth from meteorites Thermosphere: Most meteorites burn up here.,Ozone,Protects us from UV raysDestroyed by CFCs (chloroflurocarbons) and aerosol products.,Hy
4、drosphere,Fresh Water,Fresh Water,Lakes, ponds, rivers, and streams are freshwater habitats. So too are swamps, bogs, and marshes.It amounts to precious little water, less than half a percent of the worlds water supply.Yet it is essential to a wide variety of life on earth.The distribution of fresh
5、water in uneven globally. Four countries hold nearly 50% of all the fresh water on Earth.,Salt water,The water of the seas and oceans is salty because of the vast quantity of mineral salts dissolved in it.,Lithosphere,Comprises the Earths crust and part of the upper mantle,Rocks and minerals,A rock is a heterogeneous blend of various grains (each grain is a mineral)A mineral is a pure, natural and inorganic substance,Formation of rocks,
