Question 1
Which of the following is
not a common rock forming mineral but by contrast is always found in living things.
◦ magnesium
◦ iron
◦ potassium
◦ carbon
Question 2
Which two elements combine to make most of the common rock forming minerals in the crust?
◦ carbon and nitrogen
◦ carbon and oxygen
◦ silicon and oxygen
◦ nitrogen and oxygen
◦ silicon and nitrogen