science crossword

5. ______ of water on earth is salt water.
7. Approximately ______ of pipelines and aqueducts carry water in the United States and Canada. That's enough to circle the earth 40 times.
9. The average daily requirement for fresh water in the United States is about _______ gallons a day, with about 300 billion gallons used as untreated water and for agriculture and other commercial purposes.
11. Only _____ percent of the earth's water is available for drinking water.
12. There are more than ______ individual water systems providing water to the public in the United States.
13. most common substance.
14. About _____ of the human body is water.
15. You can survive about a ______ without food, but only five to seven days without water

1. More than _______households drink from their own private wells and are responsible for treating and pumping the water themselves.
2. In 1974, Congress passed the _________ to ensure that drinking water is safe for consumption. The Act requires public water systems to monitor and treat drinking water for safety.
3. Industries released ________ pounds of toxic chemicals into waterways in 1990 alone
4. Public water suppliers process ______ gallons of water per day for domestic and public use.
6. americans dumped how much motor oil into the ocean?
8. _____ percent of Americans rely on lakes, rivers, and streams as their source of drinking water. The other 39 percent rely on ground water -- water located underground in aquifers and wells.
10. About _______ water wells are drilled each year in the United States for domestic, farming, commercial, and water testing purposes.