Which layer of the Earth lies directly beneath the crust?

The correct answer is the mantle, which is the layer of Earth located directly beneath the crust. The mantle is a thick, solid layer composed mainly of silicate minerals that are rich in magnesium and iron. It plays a crucial role in Earth's geology, as it is involved in processes such as plate tectonics and mantle convection.

The mantle extends to a depth of about 2,900 kilometers (1,800 miles) beneath the Earth's surface, making it the largest layer of the Earth, both in terms of volume and thickness. It is divided into the upper mantle and the lower mantle, with the upper portion being partially molten in some areas, which allows for the movement of tectonic plates.

Understanding the mantle's position beneath the crust is essential for grasping concepts related to Earth's structure and geological activity, such as volcanic eruptions and earthquakes.