Question

the oldest oceanic crust found on earth is about 200 million years old, while some continental rocks are over 4 billion years old including rocks in baltimore county. which process explains this significant age difference?
continental crust is stationary whereas oceanic crust is continually moving slowly
oceanic crust forms from weathering and erosion of continental material.
oceanic crust is destroyed at subduction zones
continental crust forms from cooled lava

Explanation:

Oceanic crust is denser than continental crust. At subduction zones, denser oceanic crust is pushed under continental crust and melted back into the mantle, recycling it and preventing old oceanic crust from remaining. Continental crust is less dense, so it is not subducted and can persist for billions of years. The other options are incorrect: continental crust is not stationary, oceanic crust forms at mid-ocean ridges not from weathering continental material, and continental crust forms from a variety of processes not just cooled lava.

Answer:

Oceanic crust is destroyed at subduction zones