Class VIII

Iron-rich igneous rocks are denser than rocks which are rich in
  1. silica
  2. cobalt
  3. Sulphur
  4. calcium
Gneiss has been transformed from
  1. sandstone
  2. limestone
  3. igneous rock
  4. shale
Metamorphic rocks become magma on melting at high
  1. temperatures
  2. pressures
  3. densities
  4. energies
After eruption of lava a type of rock is obtained called
  1. lava rock
  2. magma rock
  3. volcanic rock
  4. molten rock
A comparison between marble and limestone shows marble is more
  1. vulnerable
  2. harder
  3. weaker
  4. smaller
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