Human Impact on the Environment — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Pollution that makes lakes and rivers unsafe is called water pollution.
Water pollution kills fish and makes water unsafe to drink.
2. Loud sounds from traffic and machines cause noise pollution.
Noise pollution stresses people and disturbs animal communication.
3. Harmful chemicals soaking into soil cause land pollution.
Land pollution damages soil so plants and crops cannot grow well.
4. Sources like sun, wind, and water are called renewable energy.
Renewable energy never runs out and produces little pollution.
5. Cutting forests on a large scale is called deforestation.
Deforestation destroys habitats and removes trees that clean the air.
6. Protecting endangered species in safe areas is called wildlife conservation.
Wildlife conservation prevents species from disappearing forever from our planet.
7. Trash that breaks down naturally is called biodegradable waste.
Biodegradable waste returns nutrients to the soil safely.
8. Gases that trap heat in the atmosphere are called greenhouse gases.
Greenhouse gases warm Earth and contribute to climate change.
9. Putting things in proper bins keeps trash out of landfills.
Reducing landfill waste saves space and lowers harmful leaks.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Driving cars
→ Air pollution
Air pollution
Dumping waste in rivers
→ Water pollution
Water pollution
Cutting forests
→ Habitat loss
Habitat loss
Loud highway traffic
→ Noise pollution
Noise pollution
Different actions cause different pollution types affecting air, water, land, or sound.