Category Archives: WHAT?
71.WHAT GROWS IN THE ARCTIC REGION?
There is a difference between the Arctic Region and the Arctic Circle. The Arctic Circle goes around the northern part of the earth in a perfect circle, 66.5 degrees north of the equator. At one time, the Arctic Region was considered to be all land and water lying north of this circle.
But today, the Arctic Region is considered to be a geographical unit based on the combination of a number of different elements, especially vegetation and climate. It extends south into Canada and includes all of Greenland.
64.WHAT MAKES DIAMONDS PRECIOUS?
Why is a diamond so precious? Diamonds, of course, are rare, and anything rare has a high value. But rarity isn’t enough. A thing must also be desirable, and diamonds are very desirable, indeed.
A diamond’s capacity to reflect light gives it an appearance unlike anything else in the world. The diamond is also the hardest substance known to man. A thing of beauty that can last for thousands of years, it has come to be a symbol of enduring love and loyalty.
63.WHAT IS THE NITROGEN CYCLE?
All living things need nitrogen in a form their bodies can use. It is important to plants and animals as well as to humans. It is a necessary part of the protein substance which is man’s body-building material. Without this substance, no one could grow or repair damaged or worn-out tissues.
While oxygen makes up only 21 per cent of the air we breathe, nitrogen makes up 78 per cent. There are about 7,200,000 tonnes of nitrogen above a square kilometer of the earth’s Surface. It is a colorless, odorless, tasteless gas that dissolves only slightly in water.
