Planet Earth is the home of every life-form, known to us, in the universe. Its age is about 1/3 of the age of the universe and, admitted, it is a thing of beauty. A slightly squashed fair with a heavy metal core, and a lighter surface crust, wrapped in a thin sliver of sweet air to breathe, with vast oceans, fertile plains, magnificent mountains, fresh water rivers, streams, lakes and aquifers, orbiting a star which warms us, and gives us energy. But how did our home come in to existence, and what's it made of? 4.6 billion years ago, Earth was created from the remnants of dead stars that collected in a giant, dirty gas cloud. The gas cloud became denser in its center, and formed an accretion disk. Small particles started clumping together, and building larger and larger objects; until they form the objects we call "Planets" today. This process took 10 to 20 million years, and is still not very well understood. At about this time, when the solar syst...
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