They allow magma to burst between cracks, and they cause blocks of rock to seperate and form new plates.
To find the mid point,here's the formula:

In this case:
((5+1)/2,(5+2)/2)
=(6/2,7/2)
=(3,3.5) or (3,7/2)
Therefore the answer is (3,3.5) or (3,7/2).
Hope it helps!
Answer:
D. hydrogen compounds; hydrogen and helium gas; metal; rock
Explanation:
- The solar system theory suggests the formation of the solar system comprised of 98% if the gases as the hydrogen and the helium and least of the metals and rock mass.
Answer : scientists determine the absolute age of a rock in millions of years before present rather than just the age of the rock relative to the rock units around it. This information helps geologists develop more precise geological history models for the rocks and regions they study.
Explanation: