For millions of years the only source of energy for human beings was their own physical
strength. Then about a million and a half years ago they learned to make fire. They learnt to produce
heat energy by burning wood. This helped them to warm themselves. It also helped them to cook
their food and harden the articles they made by pottery.
About 3200 B.C., the Egyptians learned to use the energy of the wind to make their boats
sail. The cloth sails they put up caught the wind and gave the boats direction. In ancient times
people even learned how to harness the power of falling water from water wheels. These were used
mainly for providing water to farms for irrigation.
Until the late 1700's, wood was the most important fuel. People used wood so much that
many forests were cut down and trees began disappearing. In time coal took the place of wood. The
growing demand for coal brought a search for better mining methods. write the summary
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Answer:
For millions of years the only source of energy for human beings was their own physical
strength. Then about a million and a half years ago they learned to make fire. They learnt to produce
heat energy by burning wood. This helped them to warm themselves. It also helped them to cook
their food and harden the articles they made by pottery.
About 3200 B.C., the Egyptians learned to use the energy of the wind to make their boats
sail. The cloth sails they put up caught the wind and gave the boats direction. In ancient times
people even learned how to harness the power of falling water from water wheels. These were used
mainly for providing water to farms for irrigation.
Until the late 1700's, wood was the most important fuel. People used wood so much that
many forests were cut down and trees began disappearing. In time coal took the place of wood. The
growing demand for coal brought a search for better mining methods. write the summary