PLANET EARTH:ONLINE CHEMISTRY CLASS Question 1 What is the composition of gases in our atmosphere?   Oxygen 21 per cent oxygen. Carbon Dioxide 0.04% Nitrogen 78 per cent nitrogen  Inert Gas Argon makes up about 1% of the atmosphere  Question 2 Please list the sources of pollution and their.

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Heat energy is able to transfer in many ways. Here we will explain all the different methods of how heat transfers. Conduction Radiation Convection  Conduction (In contact/ touch) Conduction is the process by which heat energy is transmitted through collisions between neighbouring atoms or molecules. Conduction occurs more readily.