Earth

Geography

EXTERNAL STRUCTURE OF THE EARTH

a) The Atmosphere Layer of gases surrounding the earth. The earth revolves with it because it’s held onto it by gravity It’s about 330km thick.   Composition of the Atmosphere a) Gases-exist as a mixture b) Smoke particles c) Dust particles d) Water vapour   The structure of the Atmosphere It’s divided into 4 layers/zones […]

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Geography

REVOLUTION OF THE EARTH

Movement of the earth in its orbit around the sun. It’s in anticlockwise direction. The orbit of the earth’s revolution is elliptical. Takes 365 ¼ days in a year or 366 days in a leap year (every 4 years). The sun moves from the tropic of cancer to the equator and then towards tropic of

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Geography

THE ORIGIN OF THE EARTH

A star with a greater gravitational pull passed near the sun. It attracted large quantities of gaseous materials from the sun. The materials split, cooled and condensed. Heavier materials collected at the centre to form the core. Less dense materials collected around the core to form the mantle. The lightest materials formed the crust  

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Geography

THE EARTH AND THE SOLAR SYSTEM

THE EARTH AND THE SOLAR SYSTEM 

Solar system is the group of heavenly bodies comprising the sun and the nine planets.

The origin of the Solar System

Theories

A theory is a set of reasoned ideas intended to explain facts or events

Passing Star Theory
A star with a greater gravitational pull passed near the sun
It attracted large quantities of gaseous materials from the sun
The materials split, cooled and condensed to form planets
The planets were set in orbit by the passing star

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