Educational worksheet on sources of energy, including definitions, classification of energy sources, and identification of renewable and nonrenewable resources.

Worksheet: Sources of Energy

#### Q.1. Fill in the blanks with suitable words.

a) Energy is the ability to do work.
- Explanation: Energy is defined as the capacity to perform work or cause change.

b) Sun is the ultimate source of energy.
- Explanation: The Sun provides most of the Earth's energy, either directly (e.g., solar energy) or indirectly (e.g., wind, water cycles, and fossil fuels).

c) Renewable energy sources can be replenished continually.
- Explanation: Renewable energy sources, such as solar, wind, and hydropower, are naturally replenished over short periods.

d) Nonrenewable energy sources are in limited supply, in danger of depletion, and take a very long time to make.
- Explanation: Nonrenewable energy sources, like coal, oil, and natural gas, are finite and formed over millions of years.

e) Combustion of fossil fuels releases large quantities of carbon dioxide into the atmosphere.
- Explanation: Burning fossil fuels (coal, oil, and natural gas) produces carbon dioxide, a greenhouse gas that contributes to climate change.

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#### Q.2. Label the following energy sources as “Renewable” and “Nonrenewable”.

- Coal: Nonrenewable
- Explanation: Coal is a fossil fuel formed from ancient plant material over millions of years and is not replenished quickly.

- Biomass: Renewable
- Explanation: Biomass comes from organic materials (plants and waste), which can be regrown or replenished.

- Hydropower: Renewable
- Explanation: Hydropower uses the energy of flowing or falling water, which is a naturally replenished resource.

- Natural gas: Nonrenewable
- Explanation: Natural gas is a fossil fuel formed over millions of years and is not replenished quickly.

- Geothermal: Renewable
- Explanation: Geothermal energy harnesses heat from within the Earth, which is continuously available.

- Oil: Nonrenewable
- Explanation: Oil is a fossil fuel formed over millions of years and is not replenished quickly.

- Solar: Renewable
- Explanation: Solar energy comes from the Sun and is naturally replenished.

- Nuclear: Nonrenewable
- Explanation: Nuclear energy relies on uranium, which is a finite resource.

- Wind: Renewable
- Explanation: Wind energy is derived from the movement of air, which is a naturally replenished resource.

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#### Q.3. Which of the following energy sources produced from moving water?

- a) Geothermal
- b) Hydropower
- c) Biomass
- d) Natural gas

Answer: b) Hydropower
- Explanation: Hydropower uses the energy of moving water (e.g., rivers, dams) to generate electricity.

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#### Q.4. Which of the following energy sources produced by the heat stored within Earth?

- a) Geothermal
- b) Hydropower
- c) Biomass
- d) Natural gas

Answer: a) Geothermal
- Explanation: Geothermal energy is generated by tapping into the heat stored beneath the Earth's surface.

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Final Answers:

#### Q.1.
a) Energy
b) Sun
c) Renewable
d) Nonrenewable
e) Carbon dioxide

#### Q.2.
- Coal: Nonrenewable
- Biomass: Renewable
- Hydropower: Renewable
- Natural gas: Nonrenewable
- Geothermal: Renewable
- Oil: Nonrenewable
- Solar: Renewable
- Nuclear: Nonrenewable
- Wind: Renewable

#### Q.3.
b) Hydropower

#### Q.4.
a) Geothermal

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Boxed Final Answer:
\[
\boxed{
\text{Q.1: Energy, Sun, Renewable, Nonrenewable, Carbon dioxide} \\
\text{Q.2: Coal (Nonrenewable), Biomass (Renewable), Hydropower (Renewable), Natural gas (Nonrenewable), Geothermal (Renewable), Oil (Nonrenewable), Solar (Renewable), Nuclear (Nonrenewable), Wind (Renewable)} \\
\text{Q.3: Hydropower} \\
\text{Q.4: Geothermal}
}
\]