Which layer of the Earth makes up the majority of its volume?

The mantle is the layer of the Earth that constitutes the majority of its volume, accounting for about 84% of the Earth's total volume. This layer lies between the Earth's crust, which is relatively thin, and the core. The mantle is composed of solid rock that flows slowly over geological timescales, allowing for the movement of tectonic plates above it.

The composition of the mantle mainly consists of silicate minerals rich in iron and magnesium, which contribute to its substantial thickness and volume. As the mantle influences various geological processes such as mantle convection, plate tectonics, and volcanic activity, its significance extends beyond mere volume; it plays a crucial role in shaping the Earth's surface and internal dynamics.

In contrast, while the core is also a substantial part of the Earth's mass, it occupies a smaller volume compared to the mantle due to its dense composition primarily made of iron and nickel. The crust, being the outermost layer, is relatively thin and contributes minimally to the overall volume of the Earth. The outer core, while significant as a liquid layer surrounding the solid inner core, is still smaller compared to the mantle. Thus, the mantle's vast volume makes it the dominant layer within the Earth's structure.