Question

why has demand for rare earth minerals increased in recent years? (1 point)
○ they are needed to extract oil and natural gas from rock.
○ they can be sold for a high price as limited quantities are available.
○ they are valued because they do not rust or corrode.
○ they are used in a growing number of electronics.

Explanation:

• Analyze each option:
• Option 1: Rare earth minerals are not mainly used for extracting oil/gas from rock (that's more related to fracking chemicals or traditional drilling tools not rare earths).
• Option 2: High price due to limited quantity is about their market value, not the reason for increased demand (demand increase is about usage, not just price from scarcity).
• Option 3: Rare earths do rust/corrode (e.g., some can oxidize), so this is incorrect.
• Option 4: In recent years, electronics (like smartphones, electric vehicles, wind turbines) have grown rapidly, and rare earths are crucial components (e.g., in magnets, batteries, semiconductors), so their use in a growing number of electronics drives demand.

Answer:

D. They are used in a growing number of electronics.