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.
It is totalitarian government
Answer:
The last one, Minerals
Explanation:
The Colorado Plateau Province has minerals like Uranium, Coal, Gilsonite, uintaite, etc.
Spain was founded in 20 January 1479. I'm not sure but I think it was by Christopher Columbus.
Answer:
They made people work on its building projects and farmland.
Explanation:
The Incas created a working system that every person had to contribute to. If they did not contribute or were lazy, they could be put to death.