Physical Geography A
© irevise.com 2014.
All revision notes have been produced by mockness ltd for irevise.com.
Table of Contents
The Earth is made up of three layers;
- The Core
This is the centre of the Earth, and the hottest of all
three layers. It can be broken down into the inner
core and the outer core.
- The Mantle
This is the semi-liquid layer which surrounds the crust. It is extremely hot as it is heated by the Core, which causes Convection Currents.
- The Crust
This is the outer layer of the Earth, and also the thinnest layer. The crust is divided into segments, known as plates. These segments (or plates) are able to float on top of the mantle and as a result of this, they are constantly moving.
There are two types of plates; Oceanic Plates and Continental Plates. The Oceanic Plates carry the Earth’s oceans and the Continental Plates carry the earth’s continents. The movement of these plates is known as Continental drift. The point at which one plate meets another is called a plate margin or plate boundary. There are three different types of plate margins. And for each type of plate margin unique landforms or features are formed.
This is when two plates come together or collide. When two plates collide this destroys the earth’s crust. The oceanic plate is thinner and denser than the continental plate; therefore it is forced underneath the con...