(Lesson 8.02)
Which of the following is an example of a natural resource?

Question

BlackTom AI · Accepted Answer

Coal is a fossil fuel formed from the compressed, altered remains of ancient plants and is extracted from the Earth—so it qualifies as a natural resource.

1) Relevant knowledge points and concepts
- Natural resource: a material or energy source that occurs in nature and can be used by humans (examples include minerals, fossil fuels, water, timber, sunlight).
- Renewable vs. nonrenewable: renewable resources replenish on human timescales (e.g., sunlight, wind, forests if managed); nonrenewable resources form over geologic timescales and are finite (e.g., coal, oil, natural gas).
- Coal specifically: a sedimentary rock composed primarily of carbon, formed from plant material subjected to heat and pressure over millions of years; used as fuel for electricity generation and industrial processes.

2) Step-by-step reasoning process
Step 1: Determine whether the item occurs naturally without human manufacture. Coal forms in nature from plant matter—yes. 
Step 2: Determine whether humans use it as a resource. Coal is mined and burned for energy—yes.
Step 3: Conclude classification. Because it naturally occurs and is used by humans, coal is a natural resource; because it forms over geologic time, it is a nonrenewable natural resource.

3) Calculations / intermediate steps
No numeric calculations are required; reasoning is categorical: occurrence in nature + human utility = natural resource.

4) Why the correct answer is correct
Coal meets the definition: it is naturally occurring, extractable, and used for energy. Its origin (decomposed plant matter compacted and heated over millions of years) and its extraction by mining demonstrate its status as a naturally occurring material utilized by humans.

5) Why other common options would be incorrect (briefly)
- Synthetic materials (e.g., plastic) are manufactured from petrochemicals and are not natural resources in themselves.
- Manufactured goods (e.g., steel, glass) are processed products, not raw natural resources.
- Some natural items (e.g., solar energy, water, timber) are also natural resources, but if the given choices included manufactured items or processed fuels, coal is the clear natural resource among them.
  
6) Conclusion
Therefore, coal is correctly identified as a natural resource, confirming the provided answer: Coal.

(Lesson 8.02) Which of the following is an example of a natural resource?单项选择题

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