A layer of rock might have eroded is an unconformity in a sequence of rock layers that reveal about geologic history. The correct option among all the options that are given in the question is the second option or option "B". I hope that this is the answer that will come to your help.
Answer:
Mountains isolated many groups that migrated to the region. Dense forest served as a barrier to migration across the region. Vast plains facilitated the migration of people across the region.
Explanation:
CORRECT
Because the question is asking about time zones, knowledge of eastern and mountain daylight time zones is needed. (But don't worry, a quick Google search will reveal the distance to you - or even in the clock app of your iPhone!)
If the time in Colorado is 10:00pm, the time in New York would be midnight, so the latest you'll hear from them is before midnight in your time zone! (where it is still technically your birthday for you!)
Hope I helped!! :)
