Final answer:
New earth is being "born" at mid-ocean ridges by rifting, while in other areas earth is being "destroyed" at deep-ocean trenches by subduction. Rifting is the process where plates move apart, creating new oceanic crust. Subduction is the process where plates come together and one plate is forced beneath another into the mantle.
Step-by-step explanation:
In plate tectonics, new earth is being "born" at mid-ocean ridges by rifting, while in other areas earth is being "destroyed" at deep-ocean trenches by subduction (converging plates).
Mid-ocean ridges are underwater mountain ranges where new oceanic crust is formed as plates move apart. The best-known mid-ocean ridge is the Mid-Atlantic Ridge. On the other hand, deep-ocean trenches are narrow depressions where plates come together and one plate is forced beneath another into the mantle.
Thus, rifting and subduction are the geological processes responsible for the creation and destruction of Earth's crust.