1. What type of energy is coal?

Trả lời: It is a non-renewable source of energy, because it can't easily be replaced.

   What are its advantages and disadvantages?

Trả lời:

- Advantages: Inexpensive, It can be used to power machinery.

- Disadvantages: It can pollute the environment, Not environmentally friendly.

2. What type of energy is solar power ?

Trả lời: Solar power is a renewable source of energy because it comes from the sun.

   What are its advantages and disadvantages?

Trả lời:

- Advantages: It's abundant, clean and safe.

- Disadvantages: Not available and expensive.

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