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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The Islamic Republic of Pakistan has occasional problems with coastal flooding's by the cyclones but it is relatively rare. On the other side, the People's Republic of Bangladesh experiences annual flooding's by the cyclones, they cause lots of problems and casualties. The countries relief is a big disadvantage because the coastal region, as well as towards the inland, the relief is dominated by lowlands, thus the water can freely flood a very big prat of the country.
Answer:
a and c
Explanation:
Basalt pillows occur when the basalt flows into the sea and the hot lava's contact with the cold sea water, the thermal shock, shapes the basalta into a rounded (pillow-like) shape, cooling the surface while a mass of Basalt is kept inside. For this reason, we can say that basalt pillows are an underwater shape, characterized as lens-shaped masses surrounded by cooled shells.
