Worksheet 2

ICSE Class 7 Geography · Solutions for Class 7 ICSE Frank Middle School Geography · 12 solved questions

Exercise
Marks
11 Mark · Multiple Choice Questions

To reduce global warming, it is expected that people will not do one of the following:

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Increase the burning of fossil fuels

Reason — To reduce global warming we need to decrease the emission of GHGs by reducing the burning of fossil fuels, so increasing the burning of fossil fuels is the one thing people are expected not to do. Turning off electrical gadgets when not in use, planting more trees and switching to eco-friendly cars are all measures that help reduce global warming.

21 Mark · Multiple Choice Questions

The ozone molecules are destroyed in the ozone layer:

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By the chlorine atoms released from CFC

Reason — CFCs contain chlorine. UV radiation causes a chlorine atom to break away from a CFC molecule. The free chlorine atom then attacks an ozone molecule and removes one of its oxygen atoms, thereby destroying the ozone molecule. Therefore, chlorine released from CFCs is the direct agent responsible for ozone destruction in this process.

1Answer in brief

Mention two points to differentiate weather from climate.

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WeatherClimate
Weather refers to the conditions of the atmosphere of a particular place over a short period of time.Climate is the average condition of the atmosphere calculated over a long period of 35 years or more.
It is highly dynamic and may change very quickly.It is more stable and permanent in nature.
2Answer in brief

How are weather conditions recorded?

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Weather conditions are recorded by observing and measuring the different elements of weather — such as temperature, humidity, precipitation, wind direction, velocity and cloud cover — with the help of weather instruments at meteorological stations. Artificial satellites also provide images and data used for weather forecasting.

3Answer in brief

Name the factors that affect the temperature of a place.

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The temperature of a place may vary due to the following factors:

  1. Difference in the latitudinal position
  2. Altitude
  3. Distance from the sea
  4. Ocean currents
  5. Wind
  6. Vegetation cover
4Answer in brief

What causes varying pressure at different places?

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Atmospheric pressure varies at different places due to altitude, temperature, moisture content and the rotation of the Earth:

  1. Pressure decreases with altitude as the air becomes thinner or less dense.
  2. Warm air expands and rises, creating low pressure, while colder, denser air sinks and creates high pressure.
  3. Wet air exerts less pressure than dry air.
  4. The rotation of the Earth deflects winds and influences the formation of high-pressure and low-pressure zones.
5Answer in brief

Why is climate more steady than weather?

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Climate is based on the average weather conditions of a place over a long period of 35 years or more. Short-term changes in weather are therefore averaged out. Hence, climate is more stable and permanent than weather.

1Give examples

Give example — an intrusive igneous rock

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Granite

2Give examples

Give example — Sedimentary rocks

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Sandstone, shale, limestone and rock salt

3Give examples

Give example — Rocks that are used to produce energy

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Coal

4Give examples

Give example — Metamorphic rocks

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Marble, slate, graphite, schist and diamond

5Give examples

Give example — A precious stone which is a metamorphic rock

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Diamond

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