Tag: geography

• About 70.78% of the earth’s surface is covered with water.
  
• Ninety-seven percent of the water on the earth is salt water. 
• Salt water is filled with salt and other minerals, and humans cannot drink this water. 
• Although the salt can be removed, it is a difficult and expensive process.
  
• Two percent of the water on earth is glacier ice at the North and South Poles. 
• This ice is fresh water and could be melted; however, it is too far away from where people live to be usable.
  
• Less than 1% of all the water on earth is fresh water that we can actually use. 
• We use this small amount of water for drinking, transportation, heating and cooling, industry, and many other purposes.

• Ionosphere,tropsphere and stratosphere are separate layers of the atmosphere, while the point of contact or a transition zone between troposphere and stratosphere is called the tropopause. Hence option C is correct.

The continents are separated by large stretches of water called oceans. Oceans are a major part of the hydrosphere. They are all interconnected. The ocean waters are always moving. The three chief movements of ocean waters are the waves, the tides, and the ocean currents. The five major oceans are the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Southern Ocean, and the Arctic Ocean.