What other evidence was needed to determine the rate of seafloor spreading

Question:

What other evidence was needed to determine the rate of seafloor spreading?

For the first question, the age of each strip of rock is needed to determine the rate of seafloor spreading. The answer is B.

For the second question, the answer is A.

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

hope this !

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.