The Earth’s relief. The Earth’s crust. Structure of the Earth. Social Sciences

1. The Earth Crust

The structure of the Earth: 

The Earth has three layers: 

Core: 

• It is the deepest layer. 
• It is divided en two parts: 
  • Inner core – Solid. 
  • Outer core – Liquid. 

Mantle: 

• It is the middle layer. 
• It occupies the 85% of the Earth’s volume. 
• It is made by molten rock (magma). 

Crust: 

• It is the Earth surface and is the thinner layer. 
• It is the 1% of Earth’s volume. 
• It is made by solid rock. 
• The temperature increases with depth (5,000 ºC in the core).

Oceans and continents: 

• 70% of the Earth’s surface is covered by oceans and seas: 

Oceans and continents: 

Continents: 

• They are large land masses. 
• From the largest to the smallest, they are: Asia, Africa, America, Antarctica, Europe and Oceania. 

Oceans: 

• They are large masses of saltwater. 
• From the largest to the smallest, they are: Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern Ocean and Artic Ocean.