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Yogita Ingle 7 years, 3 months ago
Primary waves: The Primary waves (P waves) or push waves are first to arrive as they are fastest. These waves usually travel at the speed of about six km per second. These waves cause relatively small displacements.
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Yogita Ingle 7 years, 3 months ago
A wave is a disturbance in a medium that carries energy without a net movement of particles. It may take the form of an elastic deformation, a variation of pressure, electric or magnetic intensity, electric potential, or temperature.
There are three types of earthquake waves:
- P waves or longitudinal waves
- S waves or transverse waves
- L waves or surface waves
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Yogita Ingle 7 years, 3 months ago
Ocean Currents that move warm water away from the Equator are called warm currents. Warm currents have higher temperatures, so they are less dense than cold water. Usually warm water has a higher salinity, but it remains less dense than cold water, so cold water is heavier and flows under warm water. The water is warmed on the surface, so warm currents flow across the surface of the ocean. As a warm current cools down, it drops down and becomes a cold water currents. Cold ocean currents come from high latitude areas near the poles. The cold temperatures cause a high density, which makes cold water heavier than warm water. Cold water tends to have a lower salinity too. Cold water replaces warm water as it moves away so, cold water sometimes has an upward movement called an “upwelling”.
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Sia ? 4 years, 6 months ago
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Spring Tides |
Neap Tides |
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Spring tides are the result of the moon and sun working together to exert more pull on the earth's oceans. |
Neap tides are the result of the moon and sun working against each other's pull. |
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In Spring tide , the difference between high and low tide is the greatest. |
In Neap tide, the difference between high and low tide is the least. |
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Yogita Ingle 7 years, 3 months ago
The igneous rocks are formed when molten lava from a volcano cools down. These rocks are also known as primary rocks as they are the first to be formed and are further of two types: extrusive and intrusive. Extrusive igneous rocks are formed when magma flows out on to the earth’s surface and cools down rapidly by air to form solid fine-grained rocks. Intrusive igneous rocks are formed when molten magma cools down inside the earth’s crust.
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