Earth Science Flashcard

Front

What process leads to the formation of volcanic islands like the Mariana Islands?

Back

Melting of oceanic crust at subduction zones.

Front

What event occurs due to the sudden release of energy caused by tectonic motion?

Back

Earthquake.

Front

How does radioactive decay contribute to motion within the Earth?

Back

The density of molten rock decreases as it is heated, pushing the rock above by material with greater density.

Front

What seismic wave phenomenon helps scientists interpret the Earth's interior structure?

Back

Refraction of waves.

Front

If the Atlantic Ocean is currently 5,000 km wide and widens at a rate of 2.5 cm per year, how wide will it be in 100 million years?

Back

7,500 km.

Front

What are tectonic plates?

Back

Large sections of the Earth's lithosphere that move and interact at their boundaries.

Front

What is subduction?

Back

The process where one tectonic plate moves under another and sinks into the mantle.

Front

What is the difference between oceanic and continental crust?

Back

Oceanic crust is denser and thinner than continental crust.

Front

What is an earthquake?

Back

A sudden shaking of the ground caused by the movement of tectonic plates.

Front

What is the role of magma in volcanic activity?

Back

Magma rises to the surface, causing volcanic eruptions when pressure builds.