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.