What is pollution?
Unit 5 Week 3 Vocab

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English
•
4th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
When the environment is contaminated by trash, gases, or chemicals.
2.
FLASHCARD QUESTION
Front
What is carbon dioxide?
Back
A gas made by burning carbon and organic compounds, and by breathing.
3.
FLASHCARD QUESTION
Front
What is renewable energy?
Back
Energy that comes from natural sources, like the sun, wind, and water, and never runs out.
4.
FLASHCARD QUESTION
Front
What is non-renewable energy?
Back
Energy resource that cannot be replaced quickly once it’s used.
5.
FLASHCARD QUESTION
Front
What is biodiesel?
Back
Fuel made from vegetable oils, animal fats, and recycled grease.
6.
FLASHCARD QUESTION
Front
What are natural resources?
Back
Materials or substances that occur in nature and can be used for economic gain.
7.
FLASHCARD QUESTION
Front
What is the greenhouse effect?
Back
The warming of the Earth caused by gases in the atmosphere trapping heat.
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