History Exam

What is the first layer of earth(Closet to sun)

Crust

What is the second layer of earth closet to the top?

Mantle

What is the 3rd layer from the top?

Outer Core

What is the final and 4th layer of the earth?

Inner Core

The Inner core is made up of?

Nickel and Iron. Keeps Earths gravity

The outer core is made up of?

Liquid Sulphur and Oxygen.

The Mantle is made of?

Magma in the form of plastic

The crust is made of?

Hardened Magma. 2 segments oceanic and continental crust.

Oceanic Crust is…

5-10km thick. Can be subducted. Constantly being destroyed

Continental Crust is…

30-50km thick

Subduction is…

2 convergenet plates where one plate moves under another. This causes mountains

3 Plate boundaries/movements are(DCT)

Divergent, Convergent, Transform

Divergent is…

Plates move away, creating new crust

Convergenet is…

Plates collide, forming mountains.

Transform is…

Plates slide apart from each other, causes earth quakes. Horizontal

What was Pangea?

Supercontinent over 300 millions year ago

Wegener Theory

Continental drift was found by Wegener, helped with fossils

3 types of rocks?

Igneous, Metamorphic, Sediment

Sediment Rock

Formed from Sand, shells and pebbles.

Igneous Rock

Formed through cooling and solidification of magma or lava.

Metamorphic

Formed from Heat and pressure under earths surface

What is a convection current?

Think convection ovean. Hot art rises and circulates

How many major tectonic plates are there?

7

What are the tectonic plates(PNSEAIA)

Pacific, North America, South American, Eurasia, African, Indo-Australian, Antarctica Plate

What speed do tectonic plates move?

1.5cm a year