Isotope is the study and application of stable and radioactive isotopes to geological processes and their time scales.
Answer:
The correct answer is D. The deepest parts of the oceans, located near the continents, are the oceanic trenches.
Explanation:
The ocean trenches are large depressions at the base of the seabed, which constitute the deepest parts of the Earth. Of these, the Mariana Trench, located in the Pacific Ocean to the east of China, is the deepest, being approximately 11,000 meters deep.
These trenches are formed by the activity of tectonic plates, specifically when one plate moves below the other and by the force exerted a depression is generated in the seabed, followed by a chain of volcanic islands at a close distance.
Answer:
The crust size remains constant because the older crust is melted at subduction zones.
Explanation:
The crust is constnatly created on Earth, but the crust is constantly getting destroyed as well. This situation leads to the total size of the crust being roughly at the same level, or rather constant, as one side a new one emerges, while at the same time, on the other side it gets destroyed.
The vast majority of the new crust is formed where there are divergent plate boundaries. Here, a gap opens up between the plates that move away and magma is constantly rising to the surface and creates new crust. When it comes to the destruction of crust, it occurs at subduction zones. Here, one plate moves below another plate, and as it does it reaches the upper mantle where it gets melted and recycled because of the high temperatures and pressure.
One positive effect of devolution is that it helps maintain a cohesive state. This means that it helps the state remained unified.
