Earthquakes and Volcanoes Vocabulary Online Quiz

A caldera is a large volcanic crater formed by a major eruption leading to the collapse of the mouth of the volcano. It is distinct from other geological features like faults or hot spots.

An aftershock is a smaller earthquake that follows the main shock of a larger earthquake. They occur in the same region as the primary event.

Geothermal activity refers to the heating of underground water by magma. This process is responsible for features like geysers and hot springs.

A pyroclastic flow is a fast-moving current of hot gas and volcanic matter that moves away from a volcano. It is one of the most dangerous volcanic phenomena.

A hot spot is an area in the mantle from which heat rises as a thermal plume from deep in the Earth. This heat can melt the crust to form volcanoes even away from plate boundaries.

The Ring of Fire is a major area in the basin of the Pacific Ocean where many earthquakes and volcanic eruptions occur. It is characterized by a horseshoe shape.

A seismogram is the visual record produced by a seismograph. It displays the amplitude and duration of seismic waves.

A tsunami is a series of large ocean waves caused by an underwater earthquake, landslide, or volcanic eruption. They can travel vast distances across the ocean.

Liquefaction occurs when saturated soil loses its strength and stiffness in response to earthquake shaking, causing it to behave like a liquid.

The epicenter is the point on the Earth's surface directly above the focus, which is where the earthquake originates.

The focus (or hypocenter) is the point within the Earth where the earthquake rupture starts. It is located beneath the surface.

Seismic waves are the vibrations that travel through the Earth carrying the energy released by an earthquake. They are detected by seismographs.

A strike-slip fault is a type of fault where the rocks on either side move horizontally past each other, with little to no vertical movement.

A reverse fault occurs when the hanging wall moves upward relative to the footwall, typically caused by compressional forces in the Earth's crust.

A normal fault occurs when the hanging wall moves downward relative to the footwall, typically caused by tensional forces pulling the crust apart.

An earthquake is the shaking of the Earth's surface caused by the sudden release of energy in the crust. Aftershocks are smaller tremors that follow the main event, while volcanoes are geological features.