Question

how does coal differ from pine trees as a source of energy?
coal can be replaced easily, while pine trees are difficult to replace.
coal is a nonrenewable resource, while pine trees are a renewable resource.
coal is a clean source of energy, while pine trees cause environmental damage.
coal is an expensive source of energy, while pine trees are an inexpensive source of energy.

Explanation:

To solve this, we analyze each option:

• Option 1: Coal is non - renewable and hard to replace, pine trees (as biomass) can be replanted, so this is wrong.
• Option 2: Coal is a non - renewable resource (formed over millions of years, limited supply). Pine trees are renewable (can be grown and harvested sustainably). This is correct.
• Option 3: Coal burning releases pollutants (not clean), and using pine trees sustainably has less environmental damage, so this is wrong.
• Option 4: The cost comparison isn't a key difference in their energy source classification (renewable/non - renewable is more fundamental), and this statement is also inaccurate in general cost terms.

Answer:

B. Coal is a nonrenewable resource, while pine trees are a renewable resource.