Earth’s Structure

Geography SSS1 First Term

Week 6

Earth’s Structure

Performance Objective

The student should be able to:

1. The Earth’s structure
2. Importance of atmosphere
3. Importance of hydrosphere
4. The Internal Structure of the Earth

 

Introduction – The Earth
 

Earth is unique among the known planets: it has an abundance of water. Other worlds — including a few moons — have atmospheres, ice, and even oceans, but only Earth has the right combination to sustain life.

Earth’s oceans cover about 70 per cent of the planet’s surface with an average depth of 2.5 miles (4 kilometres). Freshwater exists in liquid form in lakes and rivers and as water vapour in the atmosphere, which causes much of Earth’s weather.

The interior structure of…