The answer is A Atlantic Ocean
Answer: a. all older oceanic crust has been subducted into the mantle
Explanation:
Oceanic crusts are generally not known to survive as long as that of one found in the Mediterranean sea which is said to be more than 300 million years old. This is because approaching 200 million years old, oceanic crusts go back into the mantle at subduction zones in a process that can most accurately be described as recycling.
It is said that the oceanic crust in question is so old that it may have been part of Tethys, one of Earth's earlier oceans.
I think its d,neap tides could be described as low high tides and high low tides
Because of the high evaporation
The answer is a. I know this because it is the only answer that is only a natural cause. Make sure your read the obvious before jumping to the conclusion that it is a hard answer. That's what i have trouble with.