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THE SUN: SOURCE OF ENERGY AND LIFE


THE SUN: SOURCE OF ENERGY AND LIFE
THE SUN: SOURCE OF ENERGY AND LIFE

The sun is only one the thousands of stars found in our Galaxy. Physical characteristics of the Sun: size, distance, mass, temperature,... The Sunís energy: its main chemical element is Hydrogen. Helium atoms. Nuclear fusion. The Seas. The Sun and life: Whereas plants use the Sunís energy directly, man uses the same energy in different ways. Summary.


INTRODUCTION
- The Sun is only one of the thousands of millions of stars which are spread out over our galaxy.
- Characteristics of the Sun: its weigh, mass, dimension, temperature.
- Importance of the Sun for the Earth.

THE SUNíS ENERGY
- Composition of the Sun
- The Sun shine
- Nuclear fusion

THE SUN AND THE EARTH
- The solar radiation
- The Aurora Borealis
- The Earth absorbs only part of the solar radiation
- The marine currents.
- The marine winds.
- Water-vapour clouds in form of rain.
- The water-cycle

THE SUN AND LIFE
- The Plant Kingdom is the only one capable of taking direct advantage of the Sunís energy.
- The photosynthesis
- Mankind receives chemical energy through the food he eats.
- Winds, water and the kinetic energy.
- Energy problems

SUMMARY

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