Earth's History

By Hannah Genness

How Earth Formed

The planet earth was formed about four point six billion years ago, how it formed was gradually a big gas and dust cloud had formed the gas and dust started to form asteroids. When the asteroids started to collide it started the formation of Earth. Eventually all the solid heaviness was towards the middle and the lighter pieces floated to the top layer.

The Earth has Four layers

The five layers of Earth consist of the Crust, Mantel, Outer Core, and Inner Core. The crust is made up of eight elements Oxygen, Silicon, Aluminum, Iron, potassium, magnesium, sodium, and Calcium. The mantel is made up of mostly solid rock, but it has flowing magma, which is a liquid rock. Although the outer core is made up of liquid iron, as opposed to the inner core which is completely solid iron, and is believed to be as hot as the surface of the sun.

Tectonic Plates

There are three different forms of plates. The tectonic plates are recognized with three different types. They're Convergent, Divergent, and Transform. Plate tectonic are scientists theory of how the earths continents formed. When the Earth was first formed there was a super continent, the theory was that the the three different types of plates Convergent, Divergent, and Transform are what rearranged the continents. It is also believed that through out the years there will have another super continent!