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:
c) Magma C
Explanation:
The magma marked with C, is a felsic (rhyolitic) magma. This type of magma has high content of silica, making it highly viscous, and it also has high content of gases. The high content of gases comes from the high viscosity, as the gases are trapped inside the magma and can not get out of it. This results in eruptions of explosive or effusive type. When the magma rises, the temperature and pressure change, with results in explosion of the trapped gases in the highly viscous magma. Through this explosion, lot of pyroclastic material is shot out of the volcano in the surrounding area, making it very dangerous for everything in its surrounding area.
soft clay and wet and sandy soil as they are more likely to collapse or corrode over time especially the wet and sandy soil which will erode with rain or water
After all ice caps have melted and the polar bears drown, and the coastal cities are all underwater, Al Gore will ride a spacecraft to the Moon or Mars and inhabit there and tell everyone I told you so...
