Subject:- Geography
Chapter:- 5 Realms of the earth
Class- 6
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Answers
Answer:
1 Within the boundary of the Earth is a collection of four interdependent parts called “spheres“: the lithosphere, hydrosphere, biosphere, and atmosphere.
2. There are many factors which make Earth suitable for life are discussed below:
Distance of the Earth from the Sun.
Importance of light on the Earth.
Importance of Earth's Atmosphere.
Importance of Ozone Layer.
Favourable Climatic Condition.
Water.
Force of attraction (Earth's gravitational pull)
3. Today, Africa is joined to Asia only by a narrow land bridge (which has been split by the Suez Canal at the Isthmus of Suez) and remains separated from Europe by the straits of Gibraltar and Sicily. ... It will close the Strait of Gibraltar quickly evaporating the Mediterranean Sea.
4. Antarctica is a desert. It does not rain or snow a lot there. When it snows, the snow does not melt and builds up over many years to make large, thick sheets of ice, called ice sheets. Antarctica is made up of lots of ice in the form of glaciers, ice shelves and icebergs.
5. The Atlantic Ocean has a long and an indented coastline. In an indented coastline, water comes close to the harbour providing a large entrance to the ships. Thus, the Atlantic Ocean is the busiest ocean in terms of trade and commerce.
6.Powered by. A strait is a narrow body of water that connects two larger bodies of water. It may be formed by a fracture in an isthmus, a narrow body of land that connects two bodies of water.
7. The atmosphere mainly contains air which is a bad conductor of heat. ... The atmosphere prevents the sudden increase in temperature during the daylight hours and during the night, it slows down the escape of heat into the outer space. In this way, atmosphere acts as a blanket.
8. The hydrosphere defines the water that covers 71% of the Earth's surface. The lithosphere refers to the rocks of the Earth's surface and upper mantle, or the depth of the plates. The atmosphere, hydrosphere, and lithosphere interact with each other to make our planet liveable.
9. The atmosphere is composed of a mix of several different gases in differing amounts. ... Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere
Explanation:
10. This balance helps keep Earth's temperature relatively stable, like a thermostat. ... This means that for shorter time periods—tens to a hundred thousand years—the temperature of Earth can vary. And, in fact, Earth swings between ice ages and warmer interglacial periods on these time scales.
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Answer:
1. The atmosphere, lithosphere, hydrosphere, biosphere.
2. Water, Favourable Climatic Condition.
3.