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2009 Year 4 Geography Term 3 Week 1 Assignment

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Introduction

2009 Year 4 Geography - Term 3 Week 1 Assignment QUESTION: Describe the composition and structure of the atmosphere The atmosphere consists of various gases, dust particles and pollutants. It also contains water vapour, ozone and carbon dioxide, the water vapour forms clouds and hence precipitation. Clouds help to prevent excessive heating of the earth by reflecting scattering and absorbing incoming solar radiation. They also prevent excessive cooling of the earth by absorbing outgoing terrestrial radiation. ...read more.

Middle

In the troposphere, as the altitude increases, the temperature decreases. The layer of the atmosphere above the troposphere is the stratosphere and it extends up to 50km in the atmosphere from the earth's surface. As the altitude in the stratosphere increases, the temperature increases. This is due to the presence of ozone which absorbs ultraviolet radiation from the sun. The stratosphere also acts like a shield to protect earth from the harmful ultraviolet radiation. Above the stratosphere is the mesosphere, this layer extends up to 80 km in the atmosphere from the earth's surface. ...read more.

Conclusion

This is due to the absorption of ultraviolet radiation and temperatures can reach up to 1500 degrees Celsius. However, although at a high temperature, it is actually not as hot as the surface of the earth. This is because temperature is the measure of the amount of kinetic energy. In the mesosphere, there is very little amount of molecules and hence, kinetic energy is lower as compared to the abundance of molecules at the earth's surface. As a result of low kinetic energy, lesser heat is produced. Prepared by a High School Student ...read more.

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