1. What step will be most effective for a manufacturer that wants to reduce the human costs of extracting the minerals it uses in its smartphones?

Question

A. switching to using gold instead of tungsten in its products
B. verifying that child labor was not used in mining these minerals**
C. committing to only mining minerals in the United States
D. decreasing the prices of its products

2. Why have most companies started to extract lithium from brine water rather than mineral ore?
A. The process is less expensive.
B. The ore deposits have been depleted.
C. The quality of lithium is higher.
D. The process is less time-consuming.**

3. Why has demand for rare earth minerals increased in recent years?
A. They are valued because they do not rust or corrode.
B. They can be sold for a high price as limited quantities are available.
C. They are used in a growing number of electronics.**
D. They are needed to extract oil and natural gas from rock.

4. Drag each ore to the metal it produces. Answers may be used more than once.
aluminum copper tin
cassiterite - chalcopyrite - corundum - bauxite

Answer 1

Number 1 - Correct.
Number 2 - Incorrect. It's A. The process is less expensive. because Evaporation takes really long, this is a disadvantage of using the brine water method.
Number 3 - Correct.
Number 4-
Aluminum : Corundum & Bauxite
Copper : Chalcopyrite
Tin : Cassiterite