For Most Minerals, the Streak Color Obtained When the Mineral

question 26

Multiple Choice

For most minerals, the streak color obtained when the mineral is scratched against a porcelain plate is

• A)only useful if the mineral is softer than porcelain.
• B)more variable than the color in a hand sample among crystals.
• C)not useful because the porcelain will often chemically react with the mineral.
• D)always dark brown or black.

---

Definitions:

Quantity Demanded

The complete quantity of a product or service that buyers are ready and capable of buying at a certain price during a designated time frame.

Demand Curve

A graph showing the relationship between the price of a good and the quantity demanded by consumers.

Supply Curve

A graphical representation showing the relationship between the price of a good and the quantity of the good that suppliers are willing to offer for sale.

Production Possibility Frontier

A graph that shows the maximum possible output combinations of two goods or services an economy can achieve when using all available resources efficiently.