7 Geography Chapter 5 Water

Chapter Notes and Summary
3/4th of earth’s surface is covered by water, so earth is called blue planet.
• process by which water changes its form and circulates between oceans, atmosphere and land is known as water cycle.
• On earth 97% water is saline and 3% water is fresh water.
• Sources of fresh water are rain, glaciers, springs, etc.
• Sources of saline water are oceans and seas.
• Movements that occur in oceans can be categorized as waves, tides and currents.
• There are two types of ocean currents namely, warm and cold.

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