Across
- 4. a high-speed rotating wind resembling a funnel that travels beneath a strong storm system
- 6. a substance, usually given by injection, that gives people or animals immunity against a disease; vaccines prompt the creation of antibodies to increase immunity against a specific pathogen
- 8. a period in which the temperature of Earth is very low for a long time, usually lasting millions of years
- 9. energy generated by the wind
Down
- 1. the process by which air, water, or land becomes dirty and unfit for use
- 2. powerful ocean wave triggered by a geological event, such as an earthquake or landslide
- 3. heat and light energy from the Sun
- 5. a wall built along the bank of a river or sea to prevent flooding
- 7. an area where solid waste is buried underground