If you need to measure wind speed and direction at a height of 10 km above the surface, the type of radar you would use is called:
A) a tropospheric assessor. B) Doppler radar.
C) a wind profiler. D) sonic radar.
C
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Why are combustion reactions generally exothermic?
A. Hydrogen easily pulls electrons from the oxygen in water molecules and is reduced. B. Combustion involves the transfer of electrons to oxygen, which has an extremely high tendency for gaining electrons. C. During combustion, oxygen is oxidized, which gives off lots of energy. D. It is highly exothermic because combustion involves an oxidation-reduction reaction between a metallic material and oxygen.
After data have been analyzed, tentative explanations or solutions proposed based on the data are called:
a) a guess b) an observation of a phenomenon c) a hypothesis d) a concept that has been tested reproducibly and is likely to be true e) a law of nature
What contributed to the forced migration of 17 million people in South Asia in the late 1940s?
What will be an ideal response?
Why is beach sediment typically quartz-rich sand?
A. quartz is the only mineral that can be sand-sized B. quartz is resistant to chemical weathering C. other minerals are not deposited on beaches D. none of the preceding