The best way to clean your oven doesn't involve harsh chemicals. A pumice stone, whether in the form of a scouring stick or ...

The NZ Defence Force says the mass of rocks stretches 250 nautical miles by 30 nautical miles. Categories: Environment , International . Tags: New Zealand , pumice mass , Volcano .

If something seems light for its size (like a bag of cotton or pumice rock), then we say it has low density. Mass is the amount of matter in an object. Volume is how much space the object takes up.