In order to ascertain useful dates on rock units to determine the age of major events. your mission is to date what is thought to be a very old fossil with a volcanic ash layer immediately above the fossil. we do know the fossil is at least more than 300 million years old. should we use carbon 14 to date the fossil, or uranium 238 to date the volcanic ash layer, and why?

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.

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How might this scientific phenomena be explained? a paper clip floats on water.