The 17 ____ Include Scandium, Yttrium, and 15 Lanthanide Chemical

question 27

Multiple Choice

The 17 ____ include scandium, yttrium, and 15 lanthanide chemical elements, including lanthanum.

• A) semi-precious minerals
• B) metallic ores
• C) non-metallic ores
• D) rare earth metals
• E) strategically important minerals

---

Definitions:

General Principle

A fundamental truth, law, or concept that serves as the foundation for a system of belief or behavior or for a chain of reasoning.

Predictions

Statements or assertions about what will happen in the future, often based on observation, hypothesis, or statistical analysis.

Heuristic

A mental shortcut or rule of thumb that simplifies decision making, not guaranteed to be optimal, perfect, or rational, but useful for making quick decisions.

Subgoal

A smaller, intermediate objective set as a step towards achieving a larger goal.