Question

With respect to minerals, which of the following is TRUE?

1) "Mineral" is a synonym for "rock"
2) All minerals have probably been discovered
3) Fewer than 20 minerals make up 95
4) Over 500,000 minerals exist
5) All minerals crystals are too small to be seen

Answer 1

The correct statement regarding minerals is that fewer than 20 minerals make up 95% of the Earth's crust. So, when you find an unknown rock, there is a good chance that at least one of those common minerals will be present.

Step-by-step explanation:

The correct statement regarding minerals is that fewer than 20 minerals make up 95% of the Earth's crust.

According to the International Mineralogical Association, there are currently 5,575 known minerals, but most rocks are composed of just a few common minerals.

So, when you find an unknown rock, there is a good chance that at least one of those common minerals will be present.