This great planet of the solar system, in the form of a ball or sphere mainly consists of rocks! In its interior rocks melted, but the outer crust is hard. Less than one-third of the earth's surface covered by land, and two-thirds by water. Outside the Earth's crust is thick between 50-120 km and called litosphere. The high parts of the crust are continents and low parts hydrological oceans, seas and lakes. All the water on the Earth's surface, oceans, lakes, rivers, and all the smaller sources are called hidrosphere.
Man has examined only the highest part of the rocky crust that forms the outer part of the country, so it is difficult to determine what constitutes its interior. During the excavation of wells and mines has been confirmed that the deeper the hole, the temperature becomes higher. Three kilometers below the Earth's surface temperature is such that the water boils.
Scientists have discovered a lot of things inside the country studying earthquakes. They believe that the temperature in the depths of the earth is not rising as rapidly as the earth's crust and that the temperature in the center of the country is not higher than 5500 levels. Sure it's great heat, because the rocks melt at a temperature of 1200 degrees!
Earth's crust has two layers. Upper layer that forms the continents and that is granite.Under granite layer is a thick layer of very hard rock called basalt. Scientists believe that in the center of the earth is a huge ball molten iron with a diameter of about 6000 km.
Between the central ball and the earth is about 3200 km thick layer
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