Subject:- Geography
Chapter:- 5 Realms of the earth
Class- 6
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Answers
b) 1. Name the four realms of the Earth are lithosphere, hydrosphere, biosphere, and atmosphere.
1) Lithosphere: It is the hard, rocky outermost shell of the Earth made up of rocks and soil. Almost three-fourths of the total area of the Earth is covered by water and the remaining one-fourth is covered by land.
1) Lithosphere: It is the hard, rocky outermost shell of the Earth made up of rocks and soil. Almost three-fourths of the total area of the Earth is covered by water and the remaining one-fourth is covered by land.(2) Atmosphere: It is the air or the layer of gases that surrounds us. The main constituent of the atmosphere is nitrogen (78%), which is followed by oxygen (21%) and gases such as carbon dioxide, xenon and argon.
1) Lithosphere: It is the hard, rocky outermost shell of the Earth made up of rocks and soil. Almost three-fourths of the total area of the Earth is covered by water and the remaining one-fourth is covered by land.(2) Atmosphere: It is the air or the layer of gases that surrounds us. The main constituent of the atmosphere is nitrogen (78%), which is followed by oxygen (21%) and gases such as carbon dioxide, xenon and argon.(3) Hydrosphere: It is the mass of water found on the Earth that includes oceans, rivers, lakes, estuaries, etc. It also includes ice caps of the polar regions, underground water and water vapour in the air.
1) Lithosphere: It is the hard, rocky outermost shell of the Earth made up of rocks and soil. Almost three-fourths of the total area of the Earth is covered by water and the remaining one-fourth is covered by land.(2) Atmosphere: It is the air or the layer of gases that surrounds us. The main constituent of the atmosphere is nitrogen (78%), which is followed by oxygen (21%) and gases such as carbon dioxide, xenon and argon.(3) Hydrosphere: It is the mass of water found on the Earth that includes oceans, rivers, lakes, estuaries, etc. It also includes ice caps of the polar regions, underground water and water vapour in the air.(4) Biosphere: The zone where land, water and air come in contact with each other to support life and where living organisms inhabit is called the biosphere.
2.)1. Earth is the only planet in the Solar System which is neither too hot nor too cold. 2. The atmospheric blanket around the earth protects it from ultra-violet and other deadly sun rays.
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.
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.)That is, while a strait lies between two land masses and connects two larger bodies of water, an isthmus lies between two bodies of water and connects two larger land masses.
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.
9.)Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and 0.93% argon. The remainder, less than 0.1%, contains such trace gases as water vapor, carbon dioxide, and ozone. ... It is thought that the present atmosphere developed from gases ejected by volcanoes.
10.)There should always be a balance among all the realms of the earth because this is how life of all forms will sustain otherwise a small disturbance will create havoc on the earth.It can be understood in the context of pollution in many water bodies of hydrosphere which is one of the realm that has taken place from last ..
C ) 1.)Australia is called an island continent as it is the only continent which is also a nation and is surrounded by water from all the four sides.
2.Fresh water is a critical resource due to the following reasons: Water is among the most precious of natural resources, essential for the survival of life on Earth. ... - Fresh water accounts for only 2.5percent of Earth's surface.! - Global water use has increased sixfold in 70 years, as the world's population tripled.!
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