TEXAS ROCKS & FOSSILS - dot.state.tx.us

3 5 6 7 8 9 12 13 14 15 16 17 18 19 32 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 52 53 54 55 56 57 65 63 64 66 58 68 59 60 62 80 69 21 27 29 20 Texas Department ...

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Background Radiation Fact Sheet - Health Physics Society

4 Radon The radioactive element with atomic number 86. It is an alpha decay product of uranium and thorium and is a gas, which results in its movement through soil.

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Information on Phosphorus Amounts & Water Quality

Phosphorus Minifact & Analysis Sheet Spring Harbor Environmental Magnet Middle School Page #2 © James E. Kotoski, 1997

Karst in the United States: A Digital Map Compilation and ...

Karst in the United States: A Digital Map Compilation and Database By David J. Weary and Daniel H. Doctor . Open-File Report 2014–1156 . U.S. Department of the Interior

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Global Water Security - DNI

iii Global Water Security Key Judgments Our Bottom Line: During the next 10 years, many countries important to the United States will experience water problems—shorta ges, poor water quality, or floods—that will risk instability and

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