Earth History 4.85 Igneous rock / Earth Layers

Front

What is the outer core?

Back

The outer core is a liquid layer of the Earth located beneath the mantle and above the inner core, primarily composed of iron and nickel.

Front

What is the crust?

Back

The crust is the outermost layer of the Earth, consisting of solid rock and forming the continents and ocean floors.

Front

What is the mantle?

Back

The mantle is a thick layer of rock located beneath the crust, making up the majority of the Earth's volume, and is involved in tectonic activity.

Front

What is magma?

Back

Magma is molten rock located beneath the Earth's surface, which can rise to form igneous rocks when it cools.

Front

What is an intrusive igneous rock?

Back

An intrusive igneous rock is formed from magma that cools and solidifies slowly beneath the Earth's surface, resulting in larger crystal grains.

Front

What is an extrusive igneous rock?

Back

An extrusive igneous rock is formed from lava that cools quickly on the Earth's surface, resulting in smaller crystal grains.

Front

Which layer of the Earth is the thickest?

Back

The mantle is the thickest layer of the Earth.

Front

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

Back

The inner core is solid and composed mainly of iron and nickel, while the outer core is liquid and also composed of iron and nickel.

Front

What is the composition of the Earth's crust?

Back

The Earth's crust is primarily composed of silicate rocks, including granite and basalt.

Front

What role does the mantle play in plate tectonics?

Back

The mantle's convection currents drive the movement of tectonic plates on the Earth's surface.