Resource and Pollution Chapter Notes | Science Olympiad for Class 3 PDF Download

What is Resources?

• Resources are things we use to meet our needs. They can be found in nature or made by people. For example, water, trees, and sunlight are natural resources, while paper, plastic, and buildings are man-made resources. 
• We use resources to make things, get energy, and help us live better.
• Some resources, like water and air, are always available, while others, like oil and coal, can run out if we don’t use them carefully. We need to take care of our resources so they last longer. 
• Recycling and reusing things help save resources. By using resources wisely, we can protect the Earth and make sure there is enough for everyone in the future.

Types of Resources

1. Natural Resources

• Definition: Natural resources are things found in nature that are essential for all living things to survive.
• Source: They are provided by nature and not made by humans.
• Types: Natural resources can be living (like plants and animals) or non-living (like water, air, and minerals).
• Examples: Water, air, soil, plants, animals, and minerals.
• Categories: Natural resources can be renewable or non-renewable.

2. Man-made Resources

• Definition: Man-made resources are things created by humans using natural resources. These are not naturally found in the environment but are made by people for various purposes.
• Source: Man-made resources are created from natural materials like wood, metals, and minerals through processing and manufacturing.
• Examples: Paper, plastic, glass, buildings, machines, and clothes are all examples of man-made resources.
• Uses: Man-made resources are used to make things like furniture, roads, houses, toys, and tools that help us in our daily lives.
• Creation Process: Humans take natural resources, such as trees or metals, and transform them into useful products. For example, wood from trees is used to make furniture, and sand is used to create glass.

3. Renewable Resources

• Definition: These are natural resources that can be replenished or replaced after a short time.
• Examples: Solar energy, wind, hydropower, and geothermal energy.
• Benefits: Solar and wind energy can generate electricity, and hydroelectricity uses flowing water to produce power.
• Environmental Impact: Renewable resources produce less pollution and help keep the environment clean and healthy for future generations.

4. Non-renewable Resources

• Definition: Non-renewable resources cannot be replaced quickly and take a long time to form.
• Examples: Coal, natural gas, and petrol (fossil fuels).
• Formation: Fossil fuels take millions of years to form and cannot be replaced once used.
• Harmful Effects: Burning these resources releases harmful gases that can cause health problems like lung and throat irritation.
• Environmental Impact: The pollution from non-renewable resources can harm the environment and disrupt ecosystems, affecting plants, animals, and humans.

Pollution

• Pollution is when harmful things like smoke, trash, or loud sounds make the air, water, land, or environment dirty and unsafe for living things. It can hurt the health of people, animals, and plants, and make it harder to live in a clean and healthy place.
• Pollution can come from things like cars, factories, and garbage. It can make the air hard to breathe, the water dirty to drink, and the land unsafe for growing food. 
• Loud noises can also be a kind of pollution, making it hard for people to relax or sleep. Taking care of the environment helps reduce pollution and keeps our world clean and safe for everyone.

Types of Pollution