Diverging Boundaries
Diverging Boundaries
Diverging Boundaries : - When things diverge, it means that they separate. For example, cars traveling in a single lane diverge or separate when the road widens into multiple lanes. Tectonic plates can diverge too. Diverging boundaries are where tectonic plates are moving apart from each other in opposite directions.
When the plates separate, they leave a rift (deep crack) between them. Magma from the atmosphere rises up into the rift and solidifies as it cools. This forms new crust, and so diverging boundaries are also known as constructive boundaries.
The mid-ocean ridges form a diverging boundary and the ridge itself is evidence that new crust is being constructed.
Diverging boundaries also occur on land. The Mid-Atlantic Ridge runs right through the island of Iceland. As a result, the island is widening as new crust is formed. Iceland has constant volcanic eruptions as the magma spews up into the rift. The rate of widening has been measured to be about 2-5 centimeters per year. That may not seem like much, but over many millions of years this seem like much, but over many millions of year this spread has formed the Atlantic Ocean.
Another place where diverging boundaries seem to be forming is in Each Africa. The Great Rift Valley, runs along the eastern part of the African continent. At present there is no obvious crack or rift in the crust with magma welling up into it, but the land is subsiding and volcanoes occur in several place. Geologists have proposed that this could be where the next ocean will form on Earth.
The type of movements that created great rift valley in the East African region is ___________________ . | |||
| Right Option : A | |||
| View Explanation | |||
Due to which type of movement of boundaries there occur formation of rift ? | |||
| Right Option : B | |||
| View Explanation | |||
The rate of widening of rifts is about __________________ | |||
| Right Option : D | |||
| View Explanation | |||
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