Ozone occurs naturally in the stratosphere and helps to protect us from harmful ultra violet radiation from the sun. Depletion of the ozone layer can lead to increase in skin cancer, reduction in crop yield, and killing of certain aquatic life form. Hydrosphere Let us examine the ocean. The oceans are very important in terms of function. They act as heat reservoirs, providing water that evaporate to form clouds, and later get released back to the earth as rain, snow or sleet, etc.
Oceans also act as sink for carbon dioxide.
Oceans sustain aquatic life, are used for transport, provide minerals., and for recreational purpose. The nature of Matter Matter is a substance that can occupy space. Matter can be divided into pure substance and mixture. A pure substance is a substance that has fixed composition. A pure substance can be divided into elements and compounds.