Oceanic Crust
Oceanic Crust
Because the oldest parts reach the continental crust and then the ocean floor sinks beneath the continental crust, into the mantle.
A saline ocean beneath it's crust.
the earths crust is 25 miles beneath the continents and 6.5 miles beneath the ocean
A deep ocean subduction trench
A saline ocean beneath it's crust.
The continental crust (one component of the crust) is, on average, much older than the oceanic crust.
A saline ocean beneath it's crust.
A saline ocean beneath it's crust.
The Sea Floor
Trenches are the lowest points on the crust of the Earth, created by the subduction of oceanic crust beneath less dense crust.