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Grade 7 Unit 3 Earth's Resources (Renewable energy…
Grade 7 Unit 3 Earth's Resources
Natural resources
How do we use material resources?
To make food and drink.
To make objects
.
A house is made from many material resources.
How do we use energy resources?
Car engine burns gasoline, converting the potential energy in the fuel into kinetic energy of the moving car.
Nonrenewable energy resources
What are the two main types of nonrenewable energy resources
?
Fossil fuel
Coal is a fossil fuel often used to generate electricity.
Petroleum -This crude oil will be refined into gasoline, diesel fuel, heating oil, kerosene, and other products.
Natural gas is a popular fuel for cooking because it is inexpensive.
Nuclear fuel
Renewable energy resources
How do humans use solar energy?
To provide energy as heat.
To produce electricity.
How to humans use geothermal energy?
To provide energy as heat.
To produce electricity.
How do humans use wind energy?
A windmill can be used to grind grain and pump surface water for irrigation.
A wind - powered water pump can pull water from deep underground when electricity is not available.
What do living things need to survive?
Sunlight energy
Plant use energy from sunlight to perform photosynthesis.
Earth's rotation allows all parts of the earth to receive energy from the sun.
Water
Only earth has liquid water to support life.
Liquid water is essential to life because cells needs liquid water in order to perform life processes
.
Earth's atmosphere
Earth's ozone layer blocks most ultraviolet radiation.
Atmospheric gases absorb and re-radiate energy through a process called the greenhouse effect.
Managing resource
s
What can happen when we use resources?
They become more expensive.
Mining and oil spills can damage ecosystems.
Burning coal can cause air and water pollution.
What are some effective ways to manage resources?
Conserving renewable resources.
Reduce the use of nonrenewable resources.
What kinds of changes can we make to manage resources?
Change laws
Change habits