Chapter 8 Vocabulary 1. normal fault The block of rock above the fault plane slides down relative to the other block. Stress that pulls rock apart. 2. reverse fault Block of rock above the fault plane moves up relative to the other block. Stress that presses rock together. 3. strike-slip fault Blocks of rock move sideways on either side of the fault plane. Stresses that push blocks of rock horizontally. 4. folded mountain A mountain that forms as continental crust is compressed and rocks bend into large folds. 5. 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 6. volcano An opening in the crust through which molten rock, rock fragments, and hot gases erupts; a mountain built up from erupted materials. 7. lava Molten rock that reaches a planet’s surface through a volcano. 8. pyroclastic flow A dense cloud of superheated gases and rock fragments that moves quickly downhill from an erupting volcano. 9. cinders rock fragments from volcanic eruption that contain holes and tunnels left by escaping gas. 10. acid rain Rain that has become more acidic than normal due to pollution or from volcano eruption 11. geyser: A type of hot spring that shoots water into the air.