Author Question: Approximately 100 elements occur in nature. How many of them are widespread in making the minerals ... (Read 122 times)

Bernana · **on:** Jul 13, 2018

Approximately 100 elements occur in nature. How many of them are widespread in making the minerals and rocks of the crust?

A) All of them
B) Three quarters of them
C) Half of them
D) A quarter of them
E) None of them

Question 2

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

A) All minerals have been discovered.
B) More than 500,000 minerals exist.
C) Mineral is a synonym for rock.
D) All minerals crystals are too small to be seen.
E) Fewer than 20 minerals make up 95 of the crust.