Class
JSS2
Term
Second Term
Week
Week 10
Topic
Environmental Hazards
Duration
40 Minutes
Instructional Materials
- Charts showing polluted environments
- Pictures of flood, erosion, and fire outbreak
- Waste bins and refuse disposal images
- Video clips on pollution and disaster scenes
- Mask and gloves (for demonstration)
- Chalkboard illustrations
Reference Books
- NERDC Basic Science Curriculum for JSS
- STAN Basic Science for Junior Secondary Schools
- Evans Basic Science for Junior Secondary Schools
- Comprehensive Basic Science by A.O. Ogunniyi
Specific Objectives
At the end of the lesson, students should be able to:
- Define environmental hazards.
- Identify types of environmental hazards.
- State causes of environmental hazards.
- Explain effects of environmental hazards.
- Suggest ways of controlling environmental hazards.
- State the importance of a clean environment.
Introduction
The environment is everything that surrounds us, including air, water, land, plants, and animals. When the environment becomes unsafe or harmful to living things, it is called an environmental hazard.
Environmental hazards can affect human health, destroy property, and disturb natural balance.
Meaning of Environmental Hazards
Environmental hazards are dangerous conditions or events in the environment that can cause harm to living things and property.
Types of Environmental Hazards
Environmental hazards can be grouped into:
1. Natural Hazards
These are hazards caused by natural forces.
Examples:
- Flood
- Earthquake
- Drought
- Erosion
- Storms
- Volcanic eruption
2. Man-Made Hazards
These are hazards caused by human activities.
Examples:
- Pollution
- Fire outbreaks
- Oil spillage
- Improper waste disposal
- Chemical leaks
Types of Pollution
1. Air Pollution
Contamination of air by harmful substances.
Causes:
- Smoke from vehicles
- Industrial gases
- Burning of waste
2. Water Pollution
Contamination of water bodies.
Causes:
- Oil spillage
- Sewage disposal
- Industrial waste
3. Land Pollution
Contamination of soil.
Causes:
- Dumping of refuse
- Chemicals and pesticides
- Plastic waste
4. Noise Pollution
Excessive unwanted sound.
Causes:
- Loudspeakers
- Vehicles
- Generators
Effects of Environmental Hazards
- Spread of diseases
- Loss of lives and property
- Destruction of farmland
- Pollution of air and water
- Displacement of people
- Poor health conditions
- Climate change
Causes of Environmental Hazards
- Human activities (industrialization, waste dumping)
- Natural disasters
- Deforestation
- Oil exploration
- Overpopulation
- Poor sanitation
Control and Prevention of Environmental Hazards
- Proper waste disposal
- Tree planting (afforestation)
- Avoid burning of waste
- Use of clean energy
- Environmental education
- Government regulations
- Proper drainage systems
Importance of Clean Environment
A clean environment:
- Prevents diseases
- Improves health
- Supports plant and animal life
- Enhances beauty of surroundings
- Promotes safe living
Disaster Management (Basic Idea)
Disaster management involves preparing for and responding to environmental hazards to reduce their effects.
Practical Activities
Activity 1: Waste Sorting
Sort waste into biodegradable and non-biodegradable materials.
Conclusion: Proper waste management reduces environmental hazards.
Activity 2: Observation of Pollution
Observe surroundings for signs of pollution.
Conclusion: Human activities can harm the environment.
Activity 3: Clean-up Exercise
Organize classroom or school environment cleaning.
Conclusion: Clean environment promotes healthy living.
Conclusion
Environmental hazards are dangerous conditions that harm humans and the environment. They can be natural or man-made. Proper environmental management helps reduce their effects and ensures healthy living.
Evaluation
Answer the following questions:
- Define environmental hazards.
- Mention two types of environmental hazards.
- State four examples of natural hazards.
- List four examples of man-made hazards.
- What is pollution?
- State three types of pollution.
- Mention five effects of environmental hazards.
- List four causes of environmental hazards.
- State five ways of controlling environmental hazards.
- Explain the importance of a clean environment.
Objective Questions
Choose the correct answer from A–D.
- Environmental hazards are ______.
A. safe conditions
B. dangerous conditions
C. food substances
D. energy sources
Answer: B
- Which of the following is a natural hazard?
A. Pollution
B. Flood
C. Oil spillage
D. Fire outbreak
Answer: B
- Air pollution is caused by ______.
A. clean water
B. smoke and gases
C. trees
D. sunlight
Answer: B
- Land pollution is caused by ______.
A. planting trees
B. dumping refuse
C. rainfall
D. wind only
Answer: B
- Noise pollution is caused by ______.
A. loud sounds
B. clean air
C. water
D. soil
Answer: A
- A major effect of environmental hazards is ______.
A. better health
B. disease outbreak
C. clean air
D. faster growth
Answer: B
- Flood is an example of ______ hazard.
A. man-made
B. chemical
C. natural
D. industrial
Answer: C
- Proper waste disposal helps to ______.
A. increase pollution
B. reduce hazards
C. destroy land
D. cause disease
Answer: B
- Burning waste causes ______ pollution.
A. air
B. water
C. noise
D. soil only
Answer: A
- A clean environment helps to ______.
A. spread disease
B. improve health
C. increase waste
D. reduce oxygen
Answer: B
Essay Questions
- Define environmental hazards and state their types.
- Explain the causes and effects of environmental hazards.
- Describe the different types of pollution.
- State ways of controlling environmental hazards.
- Explain the importance of maintaining a clean environment.
Assignment
- List five environmental hazards in your community.
- Explain three effects of pollution.
- Suggest five ways to improve your environment.
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