Question

Plz answer this question please

Answer 1

Answer:

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1 Answer : Air is a mixture because air can be separated into its constituents such as oxygen ,nitrogen etc .

2 Answer :The two uses of wind energy are :

• Generation of electricity = Windmills harness wind energy to create electricity.
• Transportation = The power of the wind is used for propulsion in sailing vessels and sail boats .

3 Answer :Carbon dioxide causes about 20 percent of Earth's greenhouse effect; water vapor accounts for about 50 percent ;and clouds account for 25 percent ..Likewise, when carbon dioxide concentrations rise ,air temperatures go up ,and more water vapor evaporates into the atmosphere - which then amplifies greenhouse heating .

4 Answer :When the rain hits the ground it creates vibrations on the soil surface .This causes earthworms, snails to come out of their burrows to the surface. Earthworms, snails find it easier to travel, across the surface of the soil when it is wet ,as they need a moist environment to survive.

5 Answer : Sky becomes clear after first rain because the dust particles in the atmosphere settles down with the rain drops .So ,sky appears clear and bright .After a rain droplets resulting in loss of the collection of water condensed and settled on dirt particles .

6 Answer : Mountaineers carry an oxygen cylinder along with them .It is because when they climb mountains, as attitude increases ,the amount of oxygen level in the atmospheric air decreases as trees are noy found at higher altitudes.As a result, Mountaineers suffer from dizzness. It can also lead to hypoxia.

Explanation:

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Answer 2

1- air is called as a mixture because many gases are present in it for example carbon dioxide carbon monoxide oxygen Methane etc .

2-(i) wind energy can be used to generate electricity.

(ii) it can be used for transportation in sailing ships.

3- if the percentage of carbon dioxide increases in air it will contribute in global warming and rise in temperature will be seen. This will lead to melting of glaciers.

4- we see earthworm after it rains because earthworms need a moist environment to survive.

5- the sky appears clear after it rains because all of the dust Laden particles have settles down.

6- mountaineers carry oxygen tanks with them because in higher altitudes the oxygen levels decrease and it is harder to breathe so they carry oxygen tanks.

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