Triangles Crossword

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Across
  1. 2. Molten rock that flows from a volcano.
  2. 4. An instrument that detects the presence of an earthquake.
  3. 7. Opening in the Earth's surface where molten erupts.
  4. 8. A group of twelve things.
Down
  1. 1. Molten rock deep within the Earth.
  2. 3. A long tailed, medium sized animal belonging to the primates.
  3. 5. The violent ejection of lava from a volcano.
  4. 6. Covering for the hands.