Which layer of the Earth comprises the greatest percent of the planet's volume?

The mantle is the layer of the Earth that comprises the greatest percentage of the planet's volume, making up about 84% of the Earth's total volume. It lies between the crust and the outer core and extends to a depth of around 2,900 kilometers (approximately 1,800 miles) below the Earth's surface. This thick, semi-solid layer is composed mainly of silicate minerals rich in magnesium and iron, which contributes to its significant volume.

The mantle plays a crucial role in Earth's geology, influencing tectonic plate movements through convection currents, which are driven by the temperature differences within the mantle itself. The inner core and outer core, while also essential layers of the Earth, are much smaller in volume compared to the mantle. The crust, being the outermost layer, is the thinnest layer relative to the volume of the mantle and the core. Therefore, the mantle's substantial volume is a fundamental aspect of Earth's internal structure.