The polar regions present an extreme climate. These regions are covered with snow and it is very cold for most part ofthe year. For six months the sun does not set at the poles while for the other six months the sun does not rise. Inwinters, the temperature can be as low as –37°C. Animals …
. The average weather pattern taken over a long time, say 25 years, is called the climate of the place.
There are special thermometers for full day range of temperature, called maximum and minimum thermometers. The maximum temperature of the day occurs generally in the afternoon while the minimum temperature occursgenerally in the early morning. Can you now understand why in summers we feel so miserable in the afternoon andcomparatively comfortable early in the morning?
All changes in the weather are caused by the sun. The sun is a huge sphere of hot gases at a very high temperature. The distance of the sun from us is very large. Even then the energy sent out by the sun is so huge that it is the source ofall heat and light …
. The day to-day condition of the atmosphere at a place with respect to the temperature, humidity, rainfall, windspeed, etc., is called the weather at that place . The temperature, humidity, and other factors are called the elements of the weather.
Rainfall is measured by an instrument called the rain gauge. It is basically a measuring cylinder with a funnel on top to collect rainwater
It is dangerous to look for long at the burning magnesium ribbon. The teachers should advise children not to stare at the burning ribbon.
A change in which one or more new substances are formed is called a chemical change. A chemical change is also called a chemical reaction. example Carbon dioxide (CO2 ) + Lime water [Ca(OH)2 ] → Calcium Carbonate (CaCO3 ) + Water (H2O)When carbon dioxide is passed through lime water, calcium carbonate is formed, which …
one or more new substances are produced in a chemical change. In addition to new products,the following may accompany a chemical change:1 Heat, light or any other radiation (ultraviolet, for example) may be given off or absorbed.2 Sound may be produced.3 A change in smell may take place or4 new smell may be given off.5 …
You must have heard of the ozone layer in our atmosphere. It protects us from the harmful ultraviolet radiation which come from the sun. Ozone absorbs this radiation and breaks down to oxygen. Oxygen is different from ozone. Can we call the breaking down of ozone a chemical change?If ultraviolet radiation were not absorbed by …
