Science Worksheet for 9-Year-Olds: Precious Water, Fertile Soil & Clean Air — 30 Objective, 15 Subjective, 10 Problem-Solving

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Instructions

Read each question carefully and answer to the best of your ability. For Part A, choose the best option or fill in the blank. For Part B and C, write your answers in complete sentences in the space provided.

Part A: Objective Questions (30 Questions)

Multiple Choice

Circle the best answer for each question.

1. Which of the following is a major source of fresh water?
  • a) Ocean
  • b) River
  • c) Sea
2. What is the most important part of fertile soil for growing plants?
  • a) Rocks
  • b) Plastic
  • c) Humus
3. What gas do we need from the air to breathe?
  • a) Oxygen
  • b) Carbon Dioxide
  • c) Nitrogen
4. Which of these is a loud sound made by a person?
  • a) A whisper
  • b) A shout
  • c) A hum
5. A person who grows food in the soil is called a...
  • a) Doctor
  • b) Farmer
  • c) Teacher
6. What can make our air dirty?
  • a) Trees
  • b) Wind
  • c) Smoke from factories
7. Which of these helps save water?
  • a) Taking a long shower
  • b) Leaving the tap running
  • c) Turning off the tap while brushing teeth
8. A sound's highness or lowness is called its...
  • a) Pitch
  • b) Volume
  • c) Color
9. What do earthworms do for the soil?
  • a) They eat the plants.
  • b) They make it hard and dry.
  • c) They help make it more fertile.
10. A baby's cry is an example of what kind of sound?
  • a) A quiet sound
  • b) A sound made by a person
  • c) A sound made by an animal
True or False

Write 'T' for True or 'F' for False next to each statement.

11. Most of the Earth's water is salt water. ____
12. All soil is the same color and texture. ____
13. Plants help to clean the air. ____
14. Laughing is a sound that often shows happiness. ____
15. It is okay to throw trash into rivers and lakes. ____
16. We can see the air around us. ____
17. Fertile soil has very few nutrients. ____
18. Sound travels through vibrations. ____
19. A scientist who studies water is called a hydrologist. ____
20. Whispering is a high-volume sound. ____
Fill in the Blanks

Complete each sentence with a word from the word bank below.

Word Bank: atmosphere, pollution, compost, pleasant, conserve, talking, oxygen, loud, water cycle, minerals

21. The continuous movement of water on, above, and below the surface of the Earth is called the .
22. Soil is made of tiny rocks, dead plants, and .
23. Harmful things added to the air, water, or soil are called .
24. The layer of air that surrounds our planet is the .
25. A sound like birds singing is often considered .
26. We need to water because it is a precious resource.
27. A normal conversation between two people involves .
28. A fire alarm is an example of a very sound designed to get attention.
29. Decayed organic material used to fertilize soil is known as .
30. Trees release , which is essential for us to breathe.

Part B: Subjective Questions (15 Questions)

Write your answer in the space provided.

1. Name two reasons why water is precious to humans.

2. What is one thing that can pollute our clean air?

3. Describe what fertile soil looks and feels like.

4. Give an example of a pleasant sound and an unpleasant sound.

5. Why is it important for different types of people, like farmers and scientists, to work together?

6. How can planting a tree help the environment?

7. What is one way people waste water at home?

8. What is the difference between a high-pitched sound and a low-pitched sound?

9. Name two things you might find in healthy, fertile soil.

10. What does it mean when we say air is "clean"?

11. List two different sounds people make when they are feeling sad.

12. Why shouldn't you pour old paint or oil onto the soil?

13. Who is an environmental scientist and what do they do?

14. How can very loud sounds be harmful?

15. What is one thing that makes our planet's water unique and important?

Part C: Problem Solving (10 Questions)

Read the scenarios and explain what you would do or what you think should happen.

1. You see a dripping faucet in the school bathroom. What should you do?

2. A new factory is being built in your town. What is one thing the factory owners should do to help keep the air clean?

3. Your family wants to start a small vegetable garden, but the soil in your yard is very hard and sandy. What can you do to make it more fertile?

4. Your friend is playing music very loudly on their speaker at the park where people are trying to relax. What could you say to them?

5. You and your friends have a picnic, and you have some leftover apple cores and banana peels. What is the best way to dispose of them to help the soil?

6. It hasn't rained in your town for a very long time, and the local lake is getting very low. What is one thing your family can do to help save water during this time?

7. The city wants to build a new road through a park, which means cutting down many trees. What is a problem this might cause for the air quality?

8. Imagine you are a town planner. You need to decide where to build a new playground. Why would you choose a place with clean air and healthy soil over a polluted area?

9. A person is lost in the woods and needs to get someone's attention. What kind of sound should they make and why?

10. During a class project, a classmate says that soil is just "dirt" and isn't important. How would you explain to them why fertile soil is actually very important for all of us?

Answer Key

Part A: Objective Questions

Multiple Choice
  1. b) River
  2. c) Humus
  3. a) Oxygen
  4. b) A shout
  5. b) Farmer
  6. c) Smoke from factories
  7. c) Turning off the tap while brushing teeth
  8. a) Pitch
  9. c) They help make it more fertile.
  10. b) A sound made by a person
True or False
  1. T
  2. F
  3. T
  4. T
  5. F
  6. F
  7. F
  8. T
  9. T
  10. F
Fill in the Blanks
  1. water cycle
  2. minerals
  3. pollution
  4. atmosphere
  5. pleasant
  6. conserve
  7. talking
  8. loud
  9. compost
  10. oxygen

Part B: Subjective Questions (Sample Answers)

  1. We need water for drinking to survive and for growing the food we eat.
  2. Smoke from cars and factories can pollute our air.
  3. Fertile soil is usually dark brown or black, soft, and crumbles easily. It might feel slightly damp.
  4. Pleasant sound: A person singing a nice song. Unpleasant sound: A loud alarm clock.
  5. Farmers grow food using knowledge about soil, and scientists can help them find better ways to grow food without harming the environment.
  6. A tree helps clean the air by absorbing carbon dioxide and releasing oxygen. Its roots also help hold the soil in place.
  7. Leaving the tap on while brushing teeth or washing dishes wastes a lot of water.
  8. A high-pitched sound is very high, like a whistle. A low-pitched sound is very low, like a deep drum.
  9. You can find earthworms and humus (decaying leaves and plants) in healthy soil.
  10. "Clean air" means it is free from harmful pollutants like smoke, dust, and chemicals.
  11. When people are sad, they might cry or sigh.
  12. These chemicals can poison the soil, making it infertile and harming the tiny creatures that live there.
  13. An environmental scientist is a person who studies the natural world and works to solve problems like pollution to protect the Earth.
  14. Very loud sounds can hurt our ears and cause hearing damage.
  15. It supports all known life. Earth is the only planet we know of with liquid water on its surface.

Part C: Problem Solving (Sample Answers)

  1. I should try to turn the faucet off tightly. If it still drips, I should tell a teacher or a janitor so it can be fixed.
  2. They should install special filters on their smokestacks to catch pollution before it gets into the air.
  3. You can mix in compost or other organic matter (like old leaves) to add nutrients and help the soil hold water.
  4. I could politely say, "Could you please turn your music down a little? Some people are trying to read and relax."
  5. The best way is to take them home and put them in a compost bin. This will help create fertile soil.
  6. My family could take shorter showers and only water our garden early in the morning or late at night to reduce evaporation.
  7. Trees clean the air. Cutting them down means there are fewer trees to absorb carbon dioxide, which could make the air quality in the city worse.
  8. I would choose the clean area because it's safer and healthier for children to play in. Polluted air can make them sick, and bad soil won't allow grass or plants to grow well.
  9. They should make a loud, sharp sound, like a shout or a whistle. Loud sounds travel farther and are more likely to be heard by someone who can help.
  10. I would explain that fertile soil isn't just dirt; it's full of life and nutrients that we need to grow almost all of our food, from vegetables to the grains used for bread. Without it, we wouldn't be able to eat.
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