I believe this means equal barometric pressures, I am not completely familiar with this so if i'm wrong i sincerely apologize.
If this helped please mark me brainliest.
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Answer:
As the two plates move apart from each other, which often occurs at a rate of several centimetres per year, molten rock wells up from the underlying mantle into the gap between the diverging plates and solidifies into new oceanic crust. Spreading centres are found at the crests of oceanic ridges.
Explanation:
I found this answer by taking notes in class
Atomic number is same as the protons ...
Soo... the atomic number would be 18
Because the ring is hollow
D. have not lose any kinetic energy I'm pretty sure