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Science & Mathematics Questions & Answers

Science & Mathematics Questions & Answers

What is the purpose of blood?

What is the purpose of blood?

Blood plays vital role in the life of our body. It is a fluid that circulates through the heart and blood vessels, supplying nutritive materials to every part of the body and carrying off waste products. It is colorless fluid, plasma, in which float myriads of corpuscles. There are of three kinds: red, white and platelets.

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What does cold blooded mean?

What does cold blooded mean?

Warm blooded creatures such as mammals have a body temperature which stays roughly the same whatever surroundings they are in. This temperature varies from creature to creature, for example the body temperature of any healthy human is 98.4 degrees Fahrenheit. Some creatures are cold blooded, which means that the body temperature varies according to the animals surrounding. This means that …

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Where does tobacco come from? QA For Students And Children

Kids Questionnaire - Where does tobacco come from?

Tobacco is the name given to the plant and cured leaves of Nicotiana, and it can be used in various ways – for smoking, chewing and snuffing. It was first cultivated by the Indians of North and South America. Accounts of Christopher Columbus’s first voyage in 1492 speak of the natives of Cuba using ‘smoking reeds’ – a kind of …

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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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When is the earth nearest to the sun?

When is the earth nearest to the sun?

The earth is nearest to the sun on about the second or third day in January. The distance varies because the earth spins round the sun in an elliptical orbit or path. The time when the earth is closest to the sun is called the perihelion. The time when it is farthest away the aphelion comes six months later on …

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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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Is the earth perfectly round?

Is the earth perfectly round?

No, it isn’t. The earth is in fact like a rubber ball which has been gently squashed at the top and bottom, so that it is widest at the equator. It also has four bulges which form rough corners. These are in Ireland, and near the countries of Peru, South Africa and New Guinea. Scientists call the earth’s shape an …

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