Mention the percentage of carbon in earth's crust.
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Acid rain is caused by the pollution of environment by (a) carbon dioxide and nitrogen (b) carbon monoxide and carbon dioxide
(d) Acid rain is caused by a chemical reaction that begins when compounds of sulphur dioxide and nitrogen oxide react with molecules in the atmosphere to produce acids.
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Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
(c) Volcanic action, Respiration and decay of organic matter adds/add carbon dioxide to the carbon cycle on the planet Earth. However, photosynthesis uses Carbon di oxide to produce food.
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Carbon burns in oxygen to form carbon dioxide. The properties of carbon dioxide are -
(C) totally different from both carbon and oxygen
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Lithosphere covers 1. Continental crust 2. Oceanic crust 3 Upper solid part of mantle
The Right option is : (b) 1, 2 and 3
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Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
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Name the elements that help in creating phosphorous cycle? 1. Rocks 2. Earth crust 3. Air 4. Water
(a) Phosphorus cycle is also called as sedimentary cycle because the main reservoir is rocks and the earth crust.
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The earth’s plate responsible for causing earthquakes is (a) the crust of the earth
(a) the crust of the earth
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A number of elements are available in earth’s crust but most abundant elements are ____________.
(i) Al and Fe
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Chalk contains Calcium, Carbon and Oxygen in the ratio 10 : 3 : 12. Find the percentage of Carbon in chalk.
Given ratio = 10 : 3 : 12 Total part = 10 + 3 + 12 = 25 Part of Carbon = 3/25 Percentage of Carbon part in chalk 3/25 x 100=12%
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The connective in the statement “Earth revolves round the Sun and Moon is a satellite of earth” is (a) or (b) Earth
(d) Connective word is ‘and’.
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