6.2 & 6.3 (Test Practice) G

Front

What are seismic waves?

Back

Seismic waves are packets of energy produced by an earthquake.

Front

Where are earthquakes and volcanoes most likely found?

Back

Earthquakes and volcanoes are most likely found at plate boundaries.

Front

What geological process occurs at a subduction zone?

Back

Subduction is the process where one tectonic plate moves under another and is forced into the mantle.

Front

What layer of Earth is referred to as the lithosphere?

Back

The lithosphere is the rigid outer layer of Earth, consisting of the crust and the upper part of the mantle.

Front

How do oceanic and continental lithospheric plates differ?

Back

Continental lithospheric plates are thicker, less dense, and older than oceanic lithospheric plates.

Front

What is the asthenosphere?

Back

The asthenosphere is the semi-fluid layer of the mantle beneath the lithosphere, allowing tectonic plates to move.

Front

What is the mantle composed of?

Back

The mantle is composed mostly of silicate rocks that are rich in iron and magnesium.

Front

What is the inner core of the Earth made of?

Back

The inner core is composed mostly of solid iron and nickel.

Front

What is the outer core?

Back

The outer core is a liquid layer composed mainly of iron and nickel, located beneath the mantle.

Front

What is seafloor spreading?

Back

Seafloor spreading is the process by which new oceanic crust is formed at mid-ocean ridges and gradually moves away.