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Key expressions and vocabulary. The Earth has got three main parts: atmosphere, hydrosphere and geosphere. We can classify the minerals by there hardness, lustre and colour. Lava is magma that comes to the surface. Different parts of the volcanoes: crater, conduit, magma chamber and volcanic cone. Difference between fresh water/salty water/potable water. Meridians are semi circular lines that go from north to south. Parallels are circular lines that go from east to west. The Equator has got a latitude of 0º. Types of rocks: sedimentary, igneous, metamorphic. The layers of the geosphere and the atmosphere.
