plate tectonics
sea floor spreading
continental drift
isostasy
Answer is Right!
Answer is Wrong!
The correct answer is: A. plate tectonics.
Plate tectonics is the theory that the Earth’s surface is made up of a number of rigid plates that move relative to each other. These plates are constantly colliding, grinding, and sliding past each other, which is what causes earthquakes, volcanoes, and other geological activity.
The deep oceanic trenches are formed when one tectonic plate is subducted under another. This happens when the denser plate sinks beneath the less dense plate and is forced down into the Earth’s mantle. As the plate descends, it melts and the magma rises to the surface, forming volcanoes.
The other options are incorrect because they do not explain the formation of deep oceanic trenches.
- Option B, sea floor spreading, is the process by which new oceanic crust is created at mid-ocean ridges.
- Option C, continental drift, is the process by which the continents have moved over time.
- Option D, isostasy, is the concept that the Earth’s crust is floating on the mantle and that the continents and ocean basins are in equilibrium.