Jet Stream and Weather

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jet stream cold north to south warm west to east wind current

In the US our weather is governed by the . The high-altitude, fast flowing that moves from . The jet stream separates cold Arctic air to the north from warmer air to the south. Usually, if you’re north of the jet stream, the weather will be ; and if you’re to the south, it will be . If the jet stream is passing above your location, it’s probably raining or snowing. The jet stream isn’t straight; it’s wavy in the direction, with peaks and troughs. The farther north and south these peaks and troughs extend, the more extreme the temperatures vary.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

c

explanation:

it is the minimum amount of material needed to sustain a fission reaction.

critical mass is the minimum amount of fissionable material that must be assembled for a sustained fission reaction to take place. although two to three neutrons are produced for every fission, not all of these neutrons are available for continuing the fission reaction. if the conditions are such that the neutrons are lost at a faster rate than they are formed by fission, the chain reaction will not be self-sustaining.   at the point where the chain reaction can become self-sustaining, this is referred to as critical mass.