Whats the difference between a tornado watch and warning

Imagine that the ice at the north pole is melting much more quickly than anywhere else on earth. which of these questions is the best example of one of the three questions geographers might ask in this situation? a. when is the biggest fishing season near the north pole? b. why is ice melting faster at the north pole than anywhere else? c. how many species of whales inhabit the waters near the north pole? d. how do human populations survive in cold areas near the north pole?

Distance that the transcontinental railroad covered from omaha to san francisco.

These factors threaten north americas ecosystems