Unit 4 Review

Front

What is the Earth's core?

Back

The Earth's core is the innermost layer of the Earth, composed mainly of iron and nickel, and is divided into a solid inner core and a liquid outer core.

Front

What is the mantle?

Back

The mantle is the thick layer of rock between the Earth's crust and core, characterized by its hot, convective nature.

Front

How does the density of continental crust compare to oceanic crust?

Back

Continental crust is less dense than oceanic crust, which is why continents are found at higher elevations.

Front

What happens to seismic waves when they pass from the crust to the mantle?

Back

Seismic waves change speed when they pass from the crust to the mantle due to differences in material properties.

Front

What is a mid-ocean ridge?

Back

A mid-ocean ridge is an underwater mountain range formed by the upwelling of magma from the mantle as tectonic plates move apart.

Front

What is the relationship between the inner core and outer core?

Back

The inner core is solid and denser, while the outer core is liquid and less dense; the inner core is suspended within the outer core.

Front

What causes ocean floors to spread?

Back

Ocean floors spread when two oceanic crustal plates move apart, allowing magma to rise, cool, and form new crust.

Front

What is the role of convection in the mantle?

Back

Convection in the mantle drives the movement of tectonic plates, influencing geological activity such as earthquakes and volcanic eruptions.

Front

What is the composition of the Earth's crust?

Back

The Earth's crust is composed of a variety of rocks, including igneous, sedimentary, and metamorphic rocks.

Front

What is the significance of tectonic plates?

Back

Tectonic plates are large sections of the Earth's lithosphere that move and interact, causing earthquakes, volcanic activity, and the formation of mountains.