Rise and fall of sea level are called tides.
Tides occur due to the combined gravitational attraction of moon and sun on Surface of earth and earth center.
Tidal forces causes tides in the ocean. There is gradient of moon gravitational pull across the earth and on the surface of the earth. The tidal force on the surface of the earth pushes the water toward the earth moon line and hence tides are produced twice a day, if we assume the earth is spherical and water is uniformly distributed over the surface of earth.
But water is not uniformly distributed and there is a friction between earth crest and water so tides are lag behind the earth moon line.
Sun also cause tides but sun is very far away from earth as compared to the moon so sun tides effect is only 0.46 of the moon. Sun tides are lower than moon tides because there is a very small gradient of gravitational attraction across the earth.
When sun and moon are in line ( new moon and full moon) the sun and moon reinforce each other and tides are high then usual these tides are called spring tides.
When the moon and sun are at 90 degree angle the sun and moon partially cancel the effect of each other and tides are lower than usual these tides are called neap tides.
#Tides #OceanTides
In this video you will learn
i) What is tidal force?
ii) How tidal force from the sun and moon cause tide in ocean.
iii) Why tides are not observed in lakes and swimming pools?
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