Work Sheet:
Draw the colorful diagram of Earth with the help of text book under the heading Earth
then and Now. Write any three reasons why life was not possible on Earth then and
why life is possible now
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A special planet: the habitable Earth
What makes the Earth habitable? It is the right distance from the Sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atmosphere, and it has the right chemical ingredients for life, including water and carbon.
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