Which of the following is the only substance that is found naturally in the atmosphere near the Earth's surface as a solid, a liquid, and a gas?
A. water
B. carbon dioxide
C. ozone
D. molecular oxygen
Answer: A
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The drift speed of electrons in a typical circuit is
A. about the speed of sound. B. about the speed of light. C. a snail's pace. D. none of the above
Describe some specific differences you see in comparing the map and the photos. Are there any cultural features that appear on the photos and not on the map? Describe.
What will be an ideal response?
Why might the following nuclear reaction not be very good for energy production in a fission reactor? Fe ? Si + Mg + 3 neutrons
A) The material only produces a few neutrons so the chain reaction will not be very efficient. B) The reactants are too small to obtain energy from the missing mass due to strong nuclear force. C) The products are not the right size to obtain much energy from the missing mass due to the strong nuclear force. D) The mass of the byproducts is too high and therefore the energy released will not be high enough. E) Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei.
If the temperature remains unchanged and the mixing ratio drops, the relative humidity will increase
Indicate whether the statement is true or false