50. Some Important Rare Earth Minerals

According to the essay, what is the primary challenge associated with rare earth minerals?
1. They are extremely scarce and hard to find.
2. They are not useful for modern technology.
3. The process of extracting them is difficult.
4. They are only found in one country.
Which rare earth element is essential for the strong magnets used in wind turbines and electric cars?
1. Lanthanum
2. Europium
3. Neodymium
4. Dysprosium
What are two uses for lanthanum mentioned in the passage?
1. Making magnets and wind turbines
2. Camera lenses and hybrid car batteries
3. TV screens and fluorescent lights
4. Medical equipment and satellites
What is the specific role of dysprosium, as described in the essay?
1. It creates the color red on screens.
2. It makes glass and camera lenses clearer.
3. It makes magnets more heat-resistant.
4. It is the main component of smartphone batteries.
The essay suggests that many countries are trying to develop their own supplies of rare earth minerals for what main reason?
1. To become the sole producer and control the market.
2. To reduce their dependence on a single major producer.
3. Because the existing supplies are almost completely used up.
4. To make digital devices less expensive.