Resources and Trade — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
Coal is a renewable resource because we can always dig up more from the ground.
Corrected: Coal is a nonrenewable resource because it takes millions of years to form and will run out.
The corrected sentence is: "Coal is a nonrenewable resource because it takes millions of years to form and will run out.". The original sentence "Coal is a renewable resource because we can always dig up more from the ground." contained an error that needed to be fixed.
2. Fix the sentence:
Solar energy is nonrenewable because the sun will eventually burn out.
Corrected: Solar energy is renewable because the sun provides a constant supply of energy for our lifetimes.
The corrected sentence is: "Solar energy is renewable because the sun provides a constant supply of energy for our lifetimes.". The original sentence "Solar energy is nonrenewable because the sun will eventually burn out." contained an error that needed to be fixed.
3. Fix the sentence:
Trees are nonrenewable because once you cut them down they are gone forever.
Corrected: Trees are renewable because new trees can be planted and grown to replace ones that are cut down.
The corrected sentence is: "Trees are renewable because new trees can be planted and grown to replace ones that are cut down.". The original sentence "Trees are nonrenewable because once you cut them down they are gone forever." contained an error that needed to be fixed.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. Resources that can be replaced naturally over time are called renewable.
Renewable resources, like sunlight, wind, and timber, can be replenished naturally.
2. Oil, coal, and natural gas are nonrenewable resources.
Nonrenewable resources like fossil fuels take millions of years to form and cannot be replaced quickly.
3. Wind and solar energy are examples of renewable energy sources.
Wind and solar energy come from natural, replenishable sources (wind and sunlight).
4. We should conserve nonrenewable resources so they last longer.
Conserving nonrenewable resources means using them carefully and efficiently to extend their availability.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. Why is it important to conserve nonrenewable resources?
Sample answer: Nonrenewable resources like oil and coal take millions of years to form. If we use them all, they cannot be replaced in our lifetimes.
Once depleted, nonrenewable resources are gone permanently on a human timescale, making conservation essential.
2. Name two renewable resources and explain why they are renewable.
Sample answer: Water and trees are renewable. Water is recycled through the water cycle, and new trees can be planted to replace old ones.
Renewable resources can be replenished — water through the water cycle, trees through replanting and natural growth.