how do you prove that the energy we get from plants is nothing but solar energy?
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Answer:
Energy is the ability to do work. We eat, travel, do our job, socialize with people, none of these things can happen without energy. Most of the energy use today are direct or indirect forms of solar energy.
The food we eat comes from plants or animals. Plants convert light from the sun into carbohydrates and tissue. We eat plants (rice, wheat, corn, potatoes) which are foods from plants. Animals we eat such as chicken, goat, fish get their energy by eating plants. So its safe to say all food we eat is produced from solar energy.
We fill our tanks with gas, most of our power stations runs on coal. Petroleum is nothing but remains of dead animals that once existed millions of years ago. Coal is remains of trees and forest that once flourished under sunshine. So the power we get from gas and coal is nothing but a stored solar energy.
Solar energy was harvested and used by our ancestors for a long time. For example, we dry clothes outdoors. The sun shines on it, heats it up and quickens the pace at which water evaporates from the clothes. Mayans started fires using parabolic mirrors to concentrate the Sun's rays into a tiny spot on tinder. The tinder will get hot enough and burn, thus it could be used to start fire. Glass houses are being used in cold climatic region to keep crops from freezing by trapping warmth giving the sun inside a glass structure.
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