A(n) ________ spectrum is produced when white light is passed through a comparatively cool gas under low pressure
Fill in the blank(s) with correct word
dark-line (absorption)
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What kind of pollution source is a golf course that produces runoff with high nitrogen concentrations?
What will be an ideal response?
The residence time refers to the average length of time that a drop of water remains
A) intact before the hydrogen and oxygen atoms split. B) in its store. C) in motion without being stuck in a store. D) unpolluted by human activities.
Judge the following sentence according to the criteria given below: The temperatures across the Atlantic at different latitudes are much higher in Europe than in North America BECAUSE of the effects of heat transfer from the Gulf Stream
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct but the reason is incorrect. D) The assertion is incorrect but the reason is correct. E) Both the assertion and the reason are incorrect.
Which of the following features is NOT formed by precipitation of calcite from water?
A. flowstone B. stalagmite C. sinkhole D. travertine E. stalactite