Tag: spheres of earth

• The water hemisphere has only one-eighth of the world's land, Australia, New Zealand, Antarctica, a small part of Southeast Asia and the southern part of South America are in the water hemisphere.
•  Most of the Pacific Ocean and the Indian Ocean is on the water hemisphere.
• Southern Hemisphere climates tend to be slightly milder than those at similar latitudes in the Northern Hemisphere, except in the Antarctic which is colder than the Arctic.
• This is because the Southern Hemisphere has significantly more ocean and much less land; water heats up and cools down more slowly than land.

The biosphere is the layer of the planet Earth where life exists. This layer ranges from heights of up to ten kilometres above sea level. It is the fourth component of the earth. Biosphere is a life-supporting global ecosystem, where each living things depends on each other and the environment. The biosphere extends over the Earth's surface in a thin layer from a few kilometers into the atmosphere, in very cold environments, to the deep-sea vents of the ocean depths, in very hot environments.

• 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.

"Litho" is from the Greek word lithos, meaning stone. "Sphere" is from the Greek word sphaira, meaning globe or ball. The solid outer crust of any celestial body can also be called the lithosphere.