how important is sunlight to earth and its forms?
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how important is sunlight to earth and its forms?
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The Sun is the brightest and most familiar object in the sky. Earth would most probably be unfit for life without the Sun, because Life as we know it needs liquid water, and Earth is the only planet to have it: without the Sun, Earth would be an icy rock in space.
Sunlight carries energy, which warms up the Earth and is the driving force behind all our weather and climate. As the ground is heated by sunlight, it begins to radiate, but being too cool to radiate even a dull red, its radiation is in the infra-red range. A hot pot or a hot laundry iron also radiates IR, and your hand can easily sense that radiation (as heat), if held close without touching.