There are 550 active volcanos in the world, almost all of which are located at convergent tectonic plate boundaries. This includes all of the volcanoes in the pacific ring fire, such as Japan's mount fuji, as well as mount saint helens, popocafepeti in mexico and Azul in the Andes range.
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The question here is what does "sink under the ocean" mean. Under the ocean is the ocean floor-which is part of the oceanic crust. So if two plates meet, one of them can sink below the other -in this sence, it is true that the other plate can partially sink under the ocean.
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"The asthenosphere (Ancient Greek: ἀσθενός [asthenos] meaning "without stength", and thus "weak", and σφαίρα [sphaira] meaning "sphere") is the highly viscous, mechanically weak and ductile region of the upper mantle of the Earth. ... In some regions the asthenosphere could extend as deep as 700 km (430 mi)."
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the last one am from africa and am sure its correct
At its greatest extent, the Arab Empire controlled 3/4 of the Mediterranean region, the only other empire besides the Roman Empire to control most of the Mediterranean Sea. The Mediterranean Sea was important to the Roman Empire in that it was a vital trade link with other parts of the Empire, especially the Middle East and North Africa. As Rome grew, it needed the grains and other food from the Levant, and African animals were considered status symbols in the Roman royal courts.
