TECHNOLOGY
EARTH SCIENCES QUIZ
Please answer to the following Earth Sciences Question. Then you can indicate who must answer question 2.
One of the most common minerals in the Earth's crust is a nearly pure silicon dioxide. Purple amethyst and most sand are made of this mineral, which the ancients called rock crystal. What is it called today?
One of the most common minerals in the Earth's crust is a nearly pure silicon dioxide. Purple amethyst and most sand are made of this mineral, which the ancients called rock crystal. What is it called today?
