Across
1. A volcano surrounded by tall,
cone-shaped mountain made out of
lava, ash, and pyroclasic rock.
3. Piles of hardened lava
surrounding an underwater volcanic
eruption.
5. Large boulder like chunks of
cooled lava that is shot up in the air
during an eruption.
8. A pit in the ground left by a
collapsed volcano.
9. Small pieces of lava.
12. Pools of water warmed by hot
rocks beneath ground.
14. Rock formed from materials
deposited at the bottom of a body of
water.
17. Glassy strains of harden
volcanic material.
18. The independently moving pieces
of the Earth's crust.
19. Fields of hardened lava in
smooth, rope like strands.
20. A volcano surrounded by gently
sloping hills in a circular or
fan-shaped pattern.
Down
2. A volcano surrounded by a small
Icone of volcanic rock.
4. Magma that has risen to the
surface of the Earth.