Hydrosphere

Objectives

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- To understand the importance of water - To know about fresh water - To know about the relief features of the ocean floor - To recognize the movements of ocean water - To understand marine resources and the need for conservation

Recap

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- Hydrosphere, the third sphere of Earth, is a collection of all forms of water on the earth. - Hydrological cycle is the continuous movement of water on Earth. - Water is available on Earth as fresh and salt water. Over 97% of the water on the Earths surface is confined to oceans. - The five major oceans of the world are the Pacific, the Atlantic, the Indian, the Southern and the Arctic ocean. - The major relief of the ocean floor are continental shelf, continental slope, continental rise, abyssal plains, ocean deeps and ocean ridges. - Marine resources are nothing but the biotic and abiotic resources found in the oceans. - Oceans are the lifelines of Earth and mankind. Hence, they need to be conserved.