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Science & Mathematics Questions & Answers

Science & Mathematics Questions & Answers

What was the first life on the Earth?

What was the first life on the Earth?

Until quite recently it was thought that there were no abundant life forms on this planet until about 600 million years ago. When we remember that the Earth itself is at least 4500 million years old, it does seem to have taken a very long time before any animals or plants appeared. Then, geologically speaking, they must have developed very …

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What is the cause of the earth’s magnetic field?

What is the cause of the earth’s magnetic field?

Originally, it was thought that the centre of the earth has magnetized iron deposits, which caused it to act like a huge permanent bar magnet. However, the theory failed to explain how the magnetic field had sustained itself for long, because even if there was magnetized iron in the core earlier, the core of the earth is so hot that …

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How long has man been walking the Earth?

How long has man been walking the Earth?

Ever since the philosopher and naturalist, Charles Darwin, and his contemporaries including Wallace, suggested that man had evolved from apes, there has been a continuous, and almost frantic quest for evidence of our ancestors. Of course, where we come from has always been a fascinating question, but it is only comparatively recently that systematic searches have been made for traces …

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How is the height of different places on earth measured from the sea level?

How is the height of different places on earth measured from the sea level?

The height of different places on earth is measured with the help of the ‘altimeter’. The instrument used for measuring the height at a place is basically a barometer. At sea level, the height of the barometric liquid (mercury) is 76 cm. When we go to higher altitudes, the barometric height goes on decreasing, and right on top, where the …

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How does the Earth keep warm?

How does the Earth keep warm?

This is a question that you have answered for yourself every time that you have been sunbathing. Almost all of the Earth’s heat, and this means its energy, must come from the Sun. In addition to this the interior of the Earth has retained much of the heat which was generated as the formation of the Earth. This internal heat …

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How can we foretell Earthquake?

How can we foretell Earthquake?

China has suffered some terrible earthquakes, and it isn’t surprising that China’s scientists want to find ways of forecasting them. In 1975, they were successful. They cleared the city of Haicheng two hours before a devastating quake and saved the city’s population. Earthquake forecasting is, however, still inexact; the Chinese have failed to predict several earthquakes since 1975, but they …

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When will the Oceans of the Earth Overflow?

When will the Oceans of the Earth Overflow?

Try this out. Plug the sink and leave the water running. It will lead to a flood in the bathroom and a scolding for letting the water overflow. Since the sink could not hold an unlimited amount of water, it let the water spill out. But even the oceans are enormous bodies of water that get flooded with water from …

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When water appeared on the Earth?

When water appeared on the Earth?

The first folds in the crust of the Earth took place in complete darkness, when the world still felt very hot. The Earth had cooled sufficiently to harden the rocks but its temperature was still far higher than that of boiling water. No water was to be found on the surface and all the water vapour coming from the burning …

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