51. How Rare Earth Minerals Are Produced

What is the main purpose of the essay?
1. To explain why rare earth minerals are important for modern devices.
2. To describe the step-by-step process of producing rare earth minerals.
3. To warn about the environmental dangers of mining.
4. To compare different methods of mining rocks.
Why is the separation step described as difficult?
1. Because the rocks are very hard to crush.
2. Because rare earth elements are found deep underground.
3. Because the elements have very similar chemical properties.
4. Because it requires a lot of water and heat.
According to the essay, what is the final step in the production process?
1. Purifying the minerals to make them high quality.
2. Turning the refined elements into metals or powders.
3. Sending the powders to factories to make batteries.
4. Treating the crushed rocks with chemicals.
What is one reason given for why scientists are working to improve production?
1. Rare earth minerals are becoming too rare to find.
2. The mining and chemical processes can create pollution.
3. The steps of separation and purification are too expensive.
4. Factories need the metals and powders to be delivered faster.
What must happen to the rocks after they are mined, before they can be processed?
1. They must be purified with chemicals.
2. They must be separated from other materials.
3. They must be turned into metal powders.
4. They must be crushed into smaller pieces.