: Extending from the crust to about 410 km deep, it includes the lithosphere (the rigid top layer) and the asthenosphere , a semi-fluid zone that allows tectonic plates to slide.
Earth's mantle is the massive layer of silicate rock located between the planet's thin outer crust and its dense, super-heated core. Accounting for about , it is the engine room of our planet, driving the geological processes that shape the surface we live on. Composition and Structure Earth’s mantle is
The mantle is approximately 2,900 kilometers (1,802 miles) thick and is primarily composed of rocks rich in magnesium and iron, such as . While it is solid rock, it behaves like an extremely viscous fluid over millions of years—a property known as plasticity. It is generally divided into three main sections: : Extending from the crust to about 410
: Located between 410 km and 660 km, where extreme pressure causes minerals to change their crystalline structure, becoming much denser. Composition and Structure The mantle is approximately 2,900
: Stretching from 660 km down to the core-mantle boundary, this region is under such immense pressure that the rock remains solid despite temperatures exceeding 3,000°C. Why It Matters
: Heat from the core creates convection currents in the mantle. These currents act like a conveyor belt, moving tectonic plates, creating mountains, and causing earthquakes.
The mantle is essential for life on Earth for several reasons:
: Extending from the crust to about 410 km deep, it includes the lithosphere (the rigid top layer) and the asthenosphere , a semi-fluid zone that allows tectonic plates to slide.
Earth's mantle is the massive layer of silicate rock located between the planet's thin outer crust and its dense, super-heated core. Accounting for about , it is the engine room of our planet, driving the geological processes that shape the surface we live on. Composition and Structure
The mantle is approximately 2,900 kilometers (1,802 miles) thick and is primarily composed of rocks rich in magnesium and iron, such as . While it is solid rock, it behaves like an extremely viscous fluid over millions of years—a property known as plasticity. It is generally divided into three main sections:
: Located between 410 km and 660 km, where extreme pressure causes minerals to change their crystalline structure, becoming much denser.
: Stretching from 660 km down to the core-mantle boundary, this region is under such immense pressure that the rock remains solid despite temperatures exceeding 3,000°C. Why It Matters
: Heat from the core creates convection currents in the mantle. These currents act like a conveyor belt, moving tectonic plates, creating mountains, and causing earthquakes.
The mantle is essential for life on Earth for several reasons: