Earth is truly a remarkable place to all of us. It provides us with basic needs such as food and water. What most people have no idea about is the history of Earth. The earth is approximately 4.6 billion years old which is as old as the other planets in the solar system.

In the very beginning, Earth was a massive, red hot, ocean of magma. It was extremely hot. In order to create Earth, continuous collisions of smaller rocks at extreme speeds in efforts to clump together as they collided caused Earth to be extremely hot.

As the planet started to decline in temperature, a thin crust slowly appeared on the surface of the planet. Water vapor began to condense in the Earth’s early atmosphere as the cooling continued. Rain kept on falling on the earth, storms raged the planet, cooling the surface. Eventually, water flooded the Earth, forming the oceans.

The first life form evolved 3.8 billion years ago. It was a single cell life form such as bacteria. Multicellular cells evolved about one billion years later. Ancestors of insects were the first creatures to evolve followed by fish then forests. Mammals did not evolve until a hundred million years after fish evolved. Finally, humans evolved 200,000 years ago.

In the past, dinosaurs roamed the Earth. Unfortunately, most of them became extinct. No one knew exactly what had happened. There are a lot of theories on why they became extinct. The most popular theory is that a giant meteor crashed into Earth and destroyed nearly everything on Earth. Another theory is that the dinosaurs could not adapt to the change in the climate. Those which survived evolved to adapt better to the new environment.

Earth's climate was a totally different place in the past. At times, Earth was a giant ball of fire, at others it was a planet entirely frozen by ice. In its long history, this planet has experienced climates that no longer exist.

Image Sources :         

http://www.sciencedaily.com/releases/2008/07/080703140716.htm

http://images2.layoutsparks.com/1/71774/sun-earth-moon-fire.jpg

http://www.blirk.net/dinosaurs-wallpaper/4/1920x1200/