less dense than the mantle. made of a liquid material. made up of oxygen which is a light element. separated from the mantle by a layer of water.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The continental crust floats on top of the mantle because the crust is
Possibilities:
- less dense than the mantle.
- made of a liquid material.
- made up of oxygen which is a light element.
- separated from the mantle by a layer of water.

less dense than the mantle.