tectonics

2. A vent in the surface of the Earth through which magma erupts; it is also the land form that is constructed by the erupted material
4. A steep-sided mount that forms when very viscous lava is extruded from a volcanic vent
7. Cinders are lava fragments about 1 centimeter in diameter
9. The maximum height of a wave crest or depth of a trough
11. A risk. An object or situation that has the possibility of injury or damage
12. The layer of rock that lies between the crust and the outer core of the Earth

1. is lava that has a rough, jagged, spiny, and generally clinkery surface.
3. An abrupt movement of soil and bedrock downhill in response to gravity
5. A weak point in the Earth's crust and upper mantle where the rock layers have ruptured and slipped
6. One of the huge sections which make up the Earth's crust
8. Fragments less than 2 millimeters (about 1/8 inch) in diameter of lava or rock blasted into the air by volcanic explosions.
10. The flowing mixture of water and debris that forms on the slopes of a volcano.
12. Molten rock containing liquids, crystals, and dissolved gases that forms within the upper part of the Earth's mantle and crust