Answer:
Upon contact with the continental plate, the oceanic plate, being denser, begins to sink into the asthenosphere. This sinking of the plate is called subduction. Once in the asthenosphere, the oceanic plate melts due to high temperatures. The melts thus formed come to the surface in the form of volcanic eruptions, forming a volcanic chain of subduction.
When two plates come in contact, a collision is created, which leads to earthquakes or sediment wrinkles, followed by their elevation and mountain formation.
<em>Thus, the mountain ranges were formed: the American Cordillera and the Himalayan mountains.</em>
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Answer:
D. Reversal of Earth's magnetic field
Explanation:
The earth's magnetic field changes over time and this causes changes in the direction of magnetization of magnetic elements or minerals in rocks.
Our magnetic field is widely believed to originate from activities within the outer core where molten iron and nickel moves. The flow of these molten elements results in the production of the magnetic signatures on earth surface.
Some elements and minerals within rocks are capable of recording the direction of magnetic fields at a period in time. Before magma cools, such minerals in these rocks aligns their poles to that of the prevailing direction of the earths magnetic field. This is how the magnetic changes at the mid-oceanic ridges are recorded.
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