Question

1) What is CBM ?
2) Mention two harmful effects of ozone depletion.3) How does greenhouse effect cause climate change.
4) What is geothermal energy ?5) How greenhouse effect can be controlled ?
6) Write down two disadvantages of solar energy that we use ?​

Answer 1

Answer:

(1) CBM: Coalbed methane (CBM) ,coalgas, coal-mine methane(CMM) are the forms of natural gas that is stored in deeply buried coal seams. CBM is generated either from a biological process as a result of microbial action or from a thermal process as a result of increasing heat with depth of the coal.

(2) Ultraviolet radiation are sufficiently energetic to break apart important biological molecules.

Leaves of the plant will be discoloured as photosynthesis will be affected

(3) Climatic changes: (I) Due to global warming, the oceans get warm up and sea level would rise flooding low-lying region. (ii) In temperate regions, the winter will be shorter and warmer but the summer will be longer and hotter.

(4) The energy which is generated by utilizing the heat of the earth's interior is called geothermal energy.

(5) (I) To reduce the consumption of fossil fuel such as coal and petroleum. (II) There should be a restriction on the emission of Co2 and CFCs from the factories and automobiles.

(6) Two disadvantages of solar energy : (I) It is available only during the daytime. (II) It is not available in cloudy weather.

Answer 2

Required solution :-

Solution I :-

CBM : Coalbed Methane

Coalbed methane is a form of natural gas that is extracted from the coal beds.  It is formed during the process of coalification, the transformation of plant material into coal. It would help in increasing domestic gas production.

Solution II :-

Two harmful effects of ozone depletion are mentioned below:

• Increases the amount of UV rays that reaches the Earth's surface.
• Increases the rate of skin cancer, eye cataracts, and immune system damage.

Solution III :-

When the level of carbon dioxide increases it gets trapped in the earth's atmosphere resulting in the rise of temperature. They lead to climate change and even affects our respiratory system. These greenhouse gases warm the polar region which change the surface energy balance and increase the net melting of snow and ice, thus reducing their coverage.

Solution IV :-

Geothermal energy is the thermal energy generated and stored inside the Earth's crust. This heat comes from the fission of radioactive materials. Hot springs, lava, and geyser are natural examples of geothermal energy.  Geothermal energy is used to heat greenhouses or to heat water that is used for irrigation. It is also used to heat buildings through district heating systems.

Some advantages of geothermal energy are as follows:

• Geothermal energy is free and abundant.
• Geothermal energy is non-polluting and environment-friendly as no harmful gases are evolved with the use of geothermal.
• The geothermal energy is used directly for the melting of ice on the roads, heating houses in winters, greenhouses etc.

Solution V :-

The following ways can help reduce greenhouse gases:

• Use energy efficient products.
• Use public transports for travelling or use bicycle/walk if it's a short distance.
• Plant more trees.

Solution VI :-

Two disadvantages of solar energy that we use are mentioned below:

• When the sun goes down or is heavily shaded, solar panels stop producing electricity.
• Installation and the initial cost of the materials are expensive.