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Monday, March 9, 2009

LESSON 18 P1 --- What Happens to the Rain


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What Happens to Rain
Rain, hail and snow are the means by which water is returned to the earth. If this did not happen then survival of life would not be possible. What becomes of the rain when it has fallen? Some of it falls into the sea and becomes a part of it again. In this way it helps to replace the water that is always taken up into the air as water vapour.
Rain which falls on the soil of flat areas sinks into it. It fills the small spaces between the grains of soil t a depth of several metres. This is the water that plants use. The roots and the tiny hair on them take up this water and pass it to the stem of the plant. It move upwards to the leaves where it is used by the plant in its food making process. The water in the stem and leaves helps to make them stiff too. The underground water makes an enormous water store that never completely dries up. What that is used by plants, or taken up into the air as water vapour (both from the surface of the soil and from the leaves of plants) is replaced by more rain.
Rain falls on hills and mountains as well as on flat ground. When this happen, the water begins to run down the hills in little rivulets. These rivulets join up and make a small, fast running stream. Others join it on its way down until a river is formed. At places, where the ground slopes steeply, the river flows very quickly and tears a deep channel for itself. Later, as the ground becomes less steep, the river makes its channel wider but not so deep. It runs a little more slowly, too. When it reaches low ground, it runs much more slowly and its channel becomes full of twists and turns. In the end, the river reaches the sea and falls into it.
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Sometimes rivers run over the rocks made of limestone. These rivers may plunge down deep holes in the rocks and flow under the ground instead of on the surface. As it flows towards the sea, the water very slowly dissolves the limestone and makes tunnels and caves under the surface.
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EXERCISES
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Q:1 Answer these questions.
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i) Describe the cycle by which rain is returned to the earth.
Ans: Water of the earth changes into water vapours. These water vapours go into air and changes into raindrops. This water comes back to the earth in form of rain.
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ii) What becomes of the rain when I t has fallen down on the earth?
Ans: When it rains the rain water sinks
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iii) How do tiny roots derive water from the soil?
Ans: The roots and the tiny hair on them take up water from earth and pass it to the stem of the plant.
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iv) How is river formed?
Ans: When rain falls on high places like hills and mountains, the water of these high places flows down forming streams. These streams join up and a river is formed.
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v) How are tunnels and caves formed under the surface of the soil?
Ans: When the rivers flow over rocks made of limestone, they make their way down these limestones. These rivers flow towards the sea and make tunnels and caves under the surface.
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vi) How important is rain to animal and plant life? Write an essay in 100 words.
Ans: Rain plays a very important role in recycling of water. Every living thing needs water for its survival and growth. There is a very large area of land irrigated by rain. Rain water also compensates the loss of water in form of water vapours. If it does not rain for a long time, the sources of waster will dry and, as a result of it there will survive no plant and animal on earth. Therefore, rain is very important to animal and plant life.
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Q:2 Make sentences using these phrases.
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Becomes of, not possible, being taken up, take up, pass it on, more upwards, run ever.
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Becomes of
Lets see what does become of him?
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Not possible
It is not possible to grow plants without light and water.
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Being taken up
The water is being taken up into the air as water vapours.
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Take up
She was too taken up with her studies to notice what was going on.
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Pass it on
Pass on this letter to your father.
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More upwards
The water of stem moves upwards to the leaves where it is used by the plant in its food making process.

Run ever
The car ran over the child.
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Q:3 Write 'T' for the t rue statement and 'F' for the false statement.
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i) Rain does not fall into the sea. ......... F
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ii) Rain water fills the small spaces between the grains of soil. ......... T
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iii) The roots do not take up the water and pass it to the stem of the plant. ........... F
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iv) The underground water makes an enormous water store. .......... T
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v) Rivers may plunge down the deep hidden in the rock. .......... T
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Q:4 Fill in the blanks.
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i) Rain water falls on the plains.
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ii) Water is used by the plant in its food making process.
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iii) Rain water runs down the hill in little rivulets.
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iv) Its channel becomes full of twists and turns.
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v) The river may plunge down deep holes in the rock.
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1 comment:

Majid said...

This chapter is confusing! @.@

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