Mean? Why is the temperature surrounding the prisms in a refratometer maintained at a constant
temperature when is use?
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What is the most important factor in determining climates.

What causes most sediment to wash or fall into a river

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it