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JSS3: BASIC SCIENCE - 1ST TERM

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  1. Family Traits | Week 1
    6Topics
    |
    1 Quiz
  2. Environmental Hazards I - Soil Erosion | Week 2
    3Topics
  3. Environmental Hazards I - Flooding | Week 3
    5Topics
    |
    1 Quiz
  4. Environmental Hazards II - Bush Burning | Week 4
    4Topics
  5. Environmental Hazards II - Deforestation | Week 5
    4Topics
    |
    1 Quiz
  6. Environmental Hazards III - Desertification | Week 6
    4Topics
    |
    1 Quiz
  7. Environmental Hazards III - Description of the Ozone Layer and its Location in the Atmosphere | Week 7
    3Topics
    |
    1 Quiz
  8. Drug and Substance Abuse | Week 8
    4Topics
    |
    1 Quiz
  9. Resources from Living Things | Week 9
    4Topics
  10. Resources from Non-Living Things | Week 10
    2Topics
    |
    1 Quiz
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ozone layer

The atmosphere is comprised of layers based on temperature. These layers include the troposphere, stratosphere, mesosphere, andthermosphere. A further region at about 500 km above the Earth’s surface is called the exosphere.

layers of atmosphere

The ozone layer,15 to 30 km above the earth’s surface, is located in the lower stratosphere, which is the second layer of the earth’s atmosphere.The stratosphere starts just above the troposphere and extends to 50 kilometers (31 miles) high, with its highest concentration at about 25km above the ground.

The stratosphere is the mass of protective gases clinging to our planet.

Like a sponge, the ozone layer absorbs bits of radiation hitting Earth from the sun. Too much radiation can damage living things, although we need some of the sun’s radiation to live.

The ozone layer acts as a shield for life on Earth.

ozone layer

Natural Production of Ozone:

When there is ultraviolet radiation from the sun and it strikes oxygen molecules (O2), the oxygen molecules absorb the high-energy protons and split into two O atoms. The highly reactive oxygen (O) atoms combine with unbroken oxygen molecules (O2) to form ozone (O3)

O2 + Uv Light → O + O.

O2 + O → O3 (Ozone)

Importance of Ozone Layer:

1. The ozone layer of the atmosphere protects life on Earth, by absorbing ultraviolet rays from the sun.

2. It brings a cooling effect to the atmosphere and the earth’s surface. 

3. It prevents health hazards like sunburn and skin cancer.

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