United States

2. The act or process of working the ground, planting seeds, and growing edible plants.
3. Document that forms the basic structure of the US government.
8. Principal author of the declaration of independence and president of the US
10. Area where the vegetation is dominated by grasses.
11. Incorrectly disposing waste.
13. Large rotating storm with high speed winds that forms over warm waters in tropical areas.
15. United States central bank.
17. The removal of a forest or stand of trees
18. The introduction into the environment of a substance that has harmful effects.

1. American holiday that celebrates the harvest of the past year.
3. War Conflict caused by historic controversy over the enslavement of black people.
4. Violent rotating column of air extending from a thunderstorm to the ground.
5. The most popular sport in the United States.
6. Politician, military general, and first president of the US.
7. Region that receives very little precipitation.
9. The extraction of valuable minerals or other geological materials from the Earth.
12. Treeless Arctic biome in which the subsoil is permanently frozen.
14. President of the US during most of the World War II.
16. Currency of the United States.