Class VIII

. Rocks are formed by combination of minerals like
  1. quartz
  2. feldspar
  3. calcite
  4. all of them
Sedimentary layers over a period of time are compacted and cemented to form
  1. sedimentary rocks
  2. mountains
  3. deserts
  4. hills
Acidic gas which makes air pollutants is
  1. carbon dioxide
  2. Sulphur dioxide
  3. nitrogen
  4. oxygen
Top of mountains at night time are
  1. hot
  2. cold
  3. mild
  4. temperate
Carbon dioxide which is present in air produces weak acid in rain called
  1. carbonic acid
  2. sulphuric acid
  3. acetic acid
  4. oxalic acid
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