Ores and Gems

These are valuable minerals prized for their rarity and beauty; often polished and used for jewelry or decoration.

• gems

• ores

• rocks

• Which gemstone is most commonly composed of pure carbon, making it one of the hardest natural substances known?

• • Emerald

• • Diamond

• • Sapphire

• • Ruby

A student describes a mineral as being metallic. What is he/she describing?

• hardness

• luster

• streak

An ore is a mineral that can be:

• mined for a profit

• crushed and sprinkled onto food

• melted easily

When a solid crystallizes out of a solution, it is called a _____.

• fracture

• lava

• precipitate

What makes an emerald often more valuable than a diamond of the same carat weight?

• Its color and rarity

• Its hardness

• Its availability

• Its clarity

A mining company sells a ton of copper ore for $150. The cost to extract and process that ton of ore is $90. What is the profit the company makes from selling one ton of copper ore?

(enter the amount of dollars only in the answer box)

Mathematical Equivalence

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