Class VIII

A stone which is used to sooth skin is glassy volcanic rock formed from lava froth is
  1. obsidian
  2. pumice
  3. basalt
  4. granite
A rock which has been transformed from shale is
  1. slate
  2. marble
  3. gneiss
  4. quartzite
A comparison between marble and limestone shows marble is more
  1. vulnerable
  2. harder
  3. weaker
  4. smaller
. Quartzite is transformed from
  1. sandstone
  2. limestone
  3. igneous rock
  4. shale
Obsidian is rich in
  1. silica
  2. iron
  3. cobalt
  4. calcium
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