6.2/6.3 Plate Tectonics Flashcard

Front

What is Plate Tectonics?

Back

The theory that explains the structure and movement of the Earth's lithosphere, which is divided into tectonic plates that float on the semi-fluid asthenosphere.

Front

What are tectonic plates?

Back

Large, rigid pieces of the Earth's lithosphere that move and interact at their boundaries, causing geological activity.

Front

What happens at plate boundaries?

Back

Most seismic (earthquake) and volcanic activity occurs at plate boundaries due to the interactions between tectonic plates.

Front

What is the difference between oceanic and continental crust?

Back

Oceanic crust is thinner and denser than continental crust, which is thicker and less dense.

Front

What is subduction?

Back

The process where one tectonic plate moves under another and sinks into the mantle, often causing earthquakes and volcanic activity.

Front

What is seafloor spreading?

Back

The process by which new oceanic crust is formed at mid-ocean ridges and gradually moves away from the ridge.

Front

What is the Ring of Fire?

Back

A major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur, primarily due to tectonic plate boundaries.

Front

How does sediment age vary with distance from mid-ocean ridges?

Back

Sediment is younger near mid-ocean ridges and becomes older as you move away from the ridge.

Front

What is an earthquake?

Back

A sudden release of energy in the Earth's crust that creates seismic waves, often caused by tectonic plate movements.

Front

What is a volcano?

Back

An opening in the Earth's crust through which molten lava, ash, and gases are expelled, often found at plate boundaries.