1. What are the major types of pollution?
2. What are natural resources?
3. What are the stars made of?
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1. The three major types of pollution are air pollution, water pollution, and land pollution.
2. Natural resources are resources that exist without any actions of humankind. This includes all valued characteristics such as commercial and industrial use, aesthetic value, scientific interest and cultural value.
3. Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores.
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