Human Impact on the Environment — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
Cutting down all the forests creates more habitats for wild animals.
Corrected: Cutting down all the forests destroys habitats for many wild animals.
Forests give shelter, food, and nesting space, so removing them harms wildlife.
2. Fix the sentence:
Throwing plastic bottles into rivers helps fish swim faster.
Corrected: Throwing plastic bottles into rivers pollutes the water and harms fish.
Plastic pollution poisons water, traps animals, and damages river ecosystems.
3. Fix the sentence:
Burning lots of coal makes the air cleaner for everyone.
Corrected: Burning lots of coal pollutes the air and harms human health.
Burning coal releases smoke and gases that dirty air and worsen breathing problems.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. Planting new trees to replace cut ones is called reforestation.
Reforestation restores forests, returning habitats and helping clean the air.
2. Sorting paper, cans, and bottles to be reused is called recycling.
Recycling saves resources and reduces what goes into landfills each day.
3. Smoke, dust, and gases dirtying the sky cause air pollution.
Air pollution comes from cars and factories, harming people and animals.
4. Energy from sunlight that never runs out is called solar energy.
Solar energy is renewable and creates electricity without burning fuels.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. Name two ways your family can help protect the environment at home.
Sample answer: We can recycle paper and cans, and turn off lights and water when not using them.
Small daily choices add up to save resources and reduce waste.
2. Why is it important not to litter in parks and streets?
Sample answer: Litter pollutes the land, harms animals that may eat it, and washes into rivers and oceans.
Litter spreads pollution and can hurt wildlife and water systems.