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Chapter 9: Earthquakes and Volcanoes

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Points: 26

Horizontales
Major belt of volcanoes that rims the Pacific Ocean.
Tension in Earth's crust pulls rock apart.
Produced by compression.
Made up of anticlines and synclines; most common type of mountain.
A weak spot in the crust where molten material, or magma, comes to the surface.
Stretches the crust so it becomes thin in the middle.
A rating system that estimates the total energy released by an earthquake.
Move slowly but can produce severe ground movements.
Product of shearing.
The first waves to arrive to the surface.
An instrument that records and measures seismic waves.
Pushes masses of rock in opposite directions.
The opening through which molten rock and gas leave a volcano.
Waves that come after P waves.
A fold in rock that bends downward to form a valley.
The point on the surface directly above the focus.
Verticales
Squeezes rock until it folds or breaks.
The shaking and trembling that results from the movement of rock beneath Earth's surface.
Formed when two normal faults cut through a block of rock.
Developed to rate earthquakes according to level of damage at a given place.
An area where material from deep within the mantle rises and then melts, forming magma.
A volcano that is not currently active, but may become active in the future.
The area beneath Earth's surface where rock that is under stress breaks, triggering earthquakes.
Occurs when an explosive eruption hurls out a mixture of hot gases, ash, cinders, and bombs.
Rating of an earthquake's magnitude.
A volcano that is no longer active and is unlikely to erupt again.
A fold in rock that bends upward into an arch.
A large area of flat land elevated high above sea level.
A force that acts on rock to change its shape or volume.