Front

What is the Earth's crust?

Back

The Earth's crust is the outermost layer of the Earth, consisting of solid rock. It is divided into two types: continental crust and oceanic crust.

Front

Where is the Earth's crust the thickest?

Back

The Earth's crust is thickest in the continental crust.

Front

What is convection current in the Earth's mantle?

Back

Convection currents are the movement of molten rock in the mantle caused by heat from the Earth's core, leading to the rising and sinking of material.

Front

Why does rock rise in convection currents?

Back

Rock rises in convection currents because it is less dense than the surrounding material.

Front

What happens to the temperature of rock as it rises?

Back

As rock rises, it generally becomes cooler and less dense.

Front

What is the lithosphere?

Back

The lithosphere is the rigid outer layer of the Earth, including the crust and the uppermost part of the mantle.

Front

Which layer of the Earth is the thinnest?

Back

The crust is the thinnest layer of the Earth.

Front

What is the mantle?

Back

The mantle is the layer of the Earth located between the crust and the outer core, composed of semi-solid rock that flows slowly.

Front

Which layer of the Earth is the second hottest?

Back

The outer core is the second hottest layer of the Earth.

Front

What is the inner core?

Back

The inner core is the solid innermost layer of the Earth, composed mainly of iron and nickel, and is extremely hot.