Plant-Earth

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Plant Earth

Earth formed about 4.5 billion ago , but it was a very different place then. Its surface was a hot inferno of mostly molten rock, with little or no liquid water and no oxygen in the atmosphere. Since then has developed oceans, continents, an oxygen- rich atmosphere-and life.

UNIQUE PLANET

    Earth is the only place in the universe known to support life. It is thought that life developed after water began to collect on earth ‘s surface. Eventually, tiny life forms evolved that could survive on water,sunlight and a few chemicals in the water. These microbes added oxygen to the atmosphere – an essential step for the development of plant and animals.

Inside the earth 

    Earth ,s interior has layers. Scientists discovered this by studying the paths by which earthquake waves pass thought the planet .crust is the different types of crust make up earth,s land and its ocean floor. The crust under land is thicker and contains more types.it is the only liquid layer , the outer core is mainly iron but also contains some nickel and small amount of other substance. Mantle this rocky layer is denser than the crust. It is mostly solid, although it can very slowly deform and flow. But the inner core is thsolid, and is mostly iron with some nickel. Its temperature is very hot – about 5,400⁰c (9,900f).

What in layer?

    Earth’s crust and mantle are the mostly made made of minerals called silicon dioxide and metal oxides. The mantle is rich in magnesium- containing silicates, whereas the two different types of crust have less magnesium- and more aluminium and calcium. The core is dominated by metallic iron. No part it has ever been brought to the surface , but its composition has been worked out by scientific methods suchas studying earthguake wave.