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hadi salman
June 14, 2013 11:06AM

i ask did demulsifier cause damage to catalysis in refinery process with referen...
hadi salman
June 14, 2013 11:06AM

i want ask about catalysis
Erich Knight
June 08, 2013 05:06AM

The Clovis people & the Younger Dryas knocked out 80% of large land mammals ...
SATHISH KOKKULA
June 04, 2013 08:06PM

Very clear and concise information.

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Expert-reviewed information about the Earth.  For everyone.

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      The Douglas-fir (scientific name: Pseudotsuga) is a genus of tree that includes ar least five species found in North America and... More »

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      Since 1999, more than 30,000 people in the United States have been reported as getting sick with West Nile virus. Infected mosquitoes spread West Nile virus (WNV) that can... More »

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Recently Updated
Switzerland Last Updated on 2013-06-18 at 20:12 Switzerland is a landlocked nation of over seven-and-a-half million people in central Europe, east of France, north of Italy.  It is at the crossroads of northern and... More »
Pollution: agricultural operations Last Updated on 2013-06-18 at 14:39 Nonpoint Source Pollution Pollution: Agricultural Operations More »
Pliocene Last Updated on 2013-06-18 at 14:31 Editor's note: The Pliocene is the period of the geologic timescale that spans the era from approximately 5.331 to 2.588 million years ago. It preceeds the Pleistocene... More »
Great Basin shrub steppe Last Updated on 2013-06-18 at 04:23 The Great Basin shrub steppe ecoregion is situated in the most northerly of the four American deserts. Unlike the other three, which have almost exclusive ties to... More »
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