Answer:
No,it is not important that it must be only fire it may be other source also
<span>By the given data the following conclusion is best supported: The oceanographer is is traveling toward a mid ocean ridge.
At the mid-ocean ridge network crust is created. So as the oceanographer moves toward it, it becomes progressively younger.
</span>
There are many factors that encourage migration, among them are wealth,
education, religion, access to better job opportunities and better
healthcare and personal reasons (family).
Therefore the one factor that does not influence migration is listed in option c:
c. Healthcare and education are not pull factors that encourage migration.
Development of more railroad systems contributed
most to US westward expansion in the second half of the nineteenth century.
The correct answer between all the choices given is the second choice or
letter B. I am hoping that this answer has satisfied your query and it will be
able to help you in your endeavor, and if you would like, feel free to ask
another question.