Class VIII

Iron-rich igneous rocks are denser than rocks which are rich in
  1. silica
  2. cobalt
  3. Sulphur
  4. calcium
After eruption of lava a type of rock is obtained called
  1. lava rock
  2. magma rock
  3. volcanic rock
  4. molten rock
Fine grained calcium carbonate layer of rock formed from micro-organisms is
  1. Shelly limestone
  2. chalk
  3. oolitic limestone
  4. all of them
A type of rock which is made as a result of cementation and compaction of sediment grains under pressure over a long period of time is called
  1. sedimentary rocks
  2. metamorphic rocks
  3. igneous rocks
  4. morphic rocks
A which is mainly composed of fossils cemented by calcium carbonate is
  1. Shelly limestone
  2. chalk
  3. oolitic limestone
  4. all of them
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