Question

(A) Why does a candle burn with a flame but coal does not?
(B) How is the burning of fossil fuels the reason for submergence of coastal areas?

Answer 1

Hint
The candle burns with a flame while the coal does not because only those substances burn with a flame that can vaporise. And the burning of fossil fuels causes the rise in water level as the heat produced melts the glaciers.

Complete step by step answer
(A) All those substances that evaporate while burning produces a flame. When the candle burns, the wax melts and changes to its liquid form. The molten wax then rises through the wick and burns in the form of vapour and as a result produces flame.
But in the case of coal, when it burns it doesn’t turn into vapour. So the burning of coal does not produce any kind of flame.
(B) The coastal areas are getting submerged due to the direct effect of the rising sea level. When the fossil fuels are burnt, huge amounts of heat and carbon dioxide is released in the atmosphere. This huge amount of heat causes the surface of the earth to get heated up. Now, due to the heating of the earth’s surface the glaciers at the polar caps of the earth are melting at a much faster rate. And due to being heated up, the water on the surface of the earth is also expanding in volume. These factors together result in the submergence of the coastal areas. Therefore we see that it is directly dependent on the burning of fossil fuels.

Note
There are primarily three types of fossil fuels, coal, natural gas and petroleum which are used by us. The burning of fossil fuels also causes a huge rise in the level of carbon dioxide in the air which is harmful for all living organisms. They also release many other poisonous gasses which are harmful for us.