Rocks in the mantle have a specific gravity of аbout: 2.7 3.0 3.3 5.5

Rocks in the mantle have a specific gravity of 3.3. Any material with s specific greater than 1 means that it is more dense than water. The mantle, making up 84% of the earth's volume, is a ductile and viscous layer of the earth that is located between the core and crust. It is composed of many elements such as: oxygen, magnesium, silicon, iron, calcium, aluminum, sodium, and potassium.

The outer crust of Earth consisting primarily of Silica and Aluminum has a specific gravity between 2.0 and 2.7, The inner crust has a Specific gravity ranging from 2.7 till 3. The mantle increases in specific gravity as we move closer to the core from 3 near the top to 5 near the bottom. The core ranges in specific gravity from 5 till 14. Therefore the answer would be the average of 5 and 3 which is 3.3.