The Earth's resources (AQA GCSE Chemistry): Revision Notes
The Earth's resources
What are Earth's resources?
Earth's resources are materials we get from our planet. Humans need these resources to survive and live comfortably. We use them to provide:
- Warmth - heating our homes
- Shelter - building materials for houses
- Food - crops and meat from animals
- Transport - fuels for cars, planes and ships
Everything we use in our daily lives ultimately comes from Earth's natural resources. From the wood in our furniture to the metals in our electronics, all materials originate from our planet's resources.
Types of resources
Renewable resources
These are resources that can be replaced naturally or grown again. This means we don't need to worry about running out of them if we manage them properly.
Examples of renewable resources:
- Trees - we can plant new ones to replace those we cut down
- Plants like cotton - farmers can grow new crops each year
- Food crops like wheat and corn - grown using fertilisers
Finite resources
These are resources that cannot be replaced once we use them up. They take millions of years to form, which means they're essentially non-renewable on human timescales.
Examples of finite resources:
- Metals like iron and copper - extracted from ores in the ground
- Crude oil - used to make fuels, plastics and synthetic materials
- Natural gas and coal
Once these resources are gone, they cannot be replaced within our lifetime or even many generations.
What happens to finite resources?
Once finite resources are used up, they're gone forever. This is why we need to use them responsibly and think about conservation.
We must take action by:
- Using them carefully
- Recycling materials when possible
- Finding alternatives
Real-world Example: Copper Conservation
Copper is a finite resource. We extract it from ores in the ground and use it to make pipes, electrical wires, and electronic components.
When copper products break or become obsolete, we should recycle the metal rather than throwing it away. This helps extend the life of our copper reserves and reduces the need for new mining operations.
Sustainable development
Understanding sustainability is crucial for our planet's future. A process is sustainable if it meets two important conditions:
- It meets our needs today - we can use resources for what we need now
- It doesn't harm future generations - there will still be resources left for people in the future
This means we must carefully balance using resources now with saving some for tomorrow.
The Sustainability Challenge
True sustainable development requires us to think beyond just our immediate needs. We must consider the long-term impact of our resource use and ensure that future generations will have access to the materials they need to thrive.
Why sustainability matters
If we use up all our finite resources today, future generations won't have any left. This would be unsustainable and could lead to serious problems for humanity's future.
Scenario: Copper Depletion
Imagine if scientists predicted that copper would run out in 38 years at current consumption rates. To address this challenge sustainably, we should:
- Recycle more copper products instead of discarding them
- Use less copper where possible by finding efficient alternatives
- Develop substitute materials that can perform similar functions
- Invest in more efficient extraction and processing methods
Key Points to Remember:
- Earth's resources provide everything humans need - warmth, shelter, food and transport
- Renewable resources can be replaced (like trees and crops)
- Finite resources cannot be replaced once used up (like metals and oil)
- Sustainable development means meeting today's needs without harming future generations
- Recycling helps finite resources last longer and reduces environmental impact