| A | B |
|---|
| folded mountain | a mountain that forms as continental crust is pushed together and rocks bend into large folds |
| fault-block mountain | a mountain that forms as blocks of rock move up or down along normal faults in areas where the lithosphere is being pulled apart |
| volcano | an opening in Earth's crust through which molten rock, rock fragments, and hot gases erupt; a mountain built up from erupted materials |
| lava | molten rock that reaches a planet's surface through a volcano |
| pyroclastic flow | a dense cloud of superheated gases and rock fragments that moves quickly downhill from a erupting volcano |
| acid rain | rain that has become more acidic than normal due to pollution |
| geyser | a type of hot spring that shoots water into the air |
| magma | the molten rock on the inside of a volcano |
