What does the presence of new rock near an oceanic ridge indicate? a. There is always a deep-sea trench underneath.
b. There is evidence of seafloor spreading.
c. They are made from oceanic crust.
d. They have iron oriented in different directions.

I believe it to be b.) There is evidence of sea floor spreading

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years

Answerglycogen;