Question

cupcake115

PLEASE HELP ME!
1. Classify the following materials as a Mineral, Gem, Ore, or None. Some may have more then one answer.
hematite
sphalerite
diamond
2. Explain why most quartz is not considered a gemstone while amethyst, which is a kind of quartz, is a gemstone.
3.What three qualities of titanium make it a good material for producing hip or knee replacements?
4.What qualities must a mineral possess in order to be considered a gems
5.Today, most mining for ore involves digging beneath Earth's surface. Why is this necessary?

Answer 1

A student was observing slides of cell division. In one of the slides, he noticed loosely coiled chromatin depicting DNA duplication. Which phase of the cell cycle could it be?

Answer 2

I'm just saying this, it's one question per post.

Answer 3

for the first one I believe it would be diamond

Answer 4

3. its non toxic, durable, and light weight