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!
Convergent plates
Continental to continental forms mountains, both plates are pushed up Continental to oceanic; Forms trenches, volcanoes, oceanic plates get pushed down.
Divergent
This is the second type of tectonic plate in the earth, this is when the plates separate from each other and form trenches and other such things.
Transform
When two plates are grinding against each other in a horizontal motion, and can react with a fault creating a crack in the earths crust.