Fill in the blank. 1. Minerals are substances with a fixed crystal structure and a unique chemical
composition
2. Processing ore sometimes involves or grinding minerals.
3. Prehistoric people used for knives and arrowheads.
4. The average American house contains about Mounds of minerals.
5. Early used rocks as simple tools as early as 2.6 million years ago.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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gas

explanation:

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