Rock is a large mass--or hard material such as stone--that can be comprised of different things (sediment, diatoms, granite, crystals, etc.). Rock has obtained its hardness due to pressure and/or time. A rock is a smaller part of a larger mass. It is also a larger mass of material comprising parts of a mountain.

About The Author

Matt Slick is the President and Founder of the Christian Apologetics and Research Ministry.