1. Why should mines be air-conditioned? 2. The chemical formula for quartz is What is the chemical formula of coesite, a polymorph of . Why are metamorphic rocks formed underground? 3. Sedimentary...

1. Why should mines be air-conditioned?

2. The chemical formula for quartz is

What is the chemical formula of coesite, a polymorph of . Why are metamorphic rocks formed underground?

3. Sedimentary rocks usually form under water. Why is this so? (Hint: Remember the role of gravity.)