answer the following. limit your answer within tree to five sentences.
1. Why are mountain building and volcanic activities associated with earthquakes?
2. Why the oceanic crust is said to be younger than continental crust?
3. How does convection current account for the movement of plates?
1. Why are mountain building and volcanic activities associated with earthquakes?
2. Why the oceanic crust is said to be younger than continental crust?
3. How does convection current account for the movement of plates?
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Explanation:
1. According to the theory of plate tectonics, Earth is an active planet. Its surface is composed of many individual plates that move and interact, constantly changing and reshaping Earth's outer layer. Volcanoes and earthquakes both result from the movement of tectonic plates.
2. It is due to the process of subduction; oceanic crust tends to get colder and denser with age as it spreads off the mid-ocean ridges. It gets so dense, that it sinks in the upper mantle (subduction). ... As the continental crust is lighter than the oceanic crust, the continental crust cannot subduct.
3. Convection currents, slab pull, and ridge push move Earth's huge tectonic plates. Convection currents in the mantle are much slower than those in boiling water. ... Because plates are rigid, the entire plate is dragged along. Ridge push occurs when material from a mid-ocean ridge slides downhill from the ridge.
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