the oldest ocean floor is only 180 million years old, because the oldest crust is destroyed at subduction zones.
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What are subduction zones?</h3>
According to NOAA, tectonic plates are fragments of the Earth's hard outer layer that steadily travel across the surface of the globe over millions of years (opens in new tab). (This is a fundamental principle of the theory of plate tectonics, which holds that pieces of the Earth's crust slide across the lower mantle and carry continents with them.) According to the U.S. Geological Survey(opens in new tab), the Earth's crust and the top part of the mantle, a thick, heated layer under the crust, make up that outer layer, also known as the lithosphere (USGS). This lithosphere material curls downward into the heated mantle during subduction zones, when two tectonic plates collide and one slides beneath the other.
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Answer:
its acually
Tokyo-Yokohama
Tokyo-Yokohama continues to be the largest city in the world, with nearly 38 million residents, according to the just released Demographia World Urban Areas (12th Annual Edition)
Near an ocean-continental convergent boundary
Explanation:
A fault is a product of brittle deformation in which a displacement occurs within the earth.
A normal and reverse fault both have an hanging wall and a foot wall.
- In a normal fault, the footwall moves upward and the hanging wall moves downward thereby causing extension.
- In a reverse fault, the footwall moves downward and the hanging wall moves upward thereby causing shortening.
- The footwall is the block on a side of the fault surface where a miner can stand whereas the hanging wall is the block on the other side.
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Recrystallization is the process through which the preexisting crystals are destroyed, and later the material left of them crystallizes all over again and forms new crystal structures. Basically this process happens when a crystal structure is exposed to high temperatures and pressures, When that happens, the crystal structure falls apart, often being melted. After it is melted, the material will eventually start to cool off again. As it cools off, new crystals will start to form. What type of crystals will form will depend on the rate of cooling off, but also on the agent that destroyed the initial crystals, as it can mix with the material, gradually giving birth to a new crystal structure.
