Compare and contrast the tides today with the tides from long ago. How are they

Question

Compare and contrast the tides today with the tides from long ago. How are they the same and how are they different. "The Tides are A Changing" (August 3,2011) http://earthsky.orgLearth the-tides-are-a-changing Scientists have discovered that ocean tides along the eastern coast of North America were substantially different 10,000 years ago. Ocean tides are often considered one of the more stable and predictable forces of nature, but a new scientific study has discovered that tides have changed substantially since prehistoric times and may change again in the future. The term "tides" refers to the alternating rise and fall of the surface level of large bodies of water caused by the effects of gravity exerted by the sun and the moon on the Earth. Most coastal areas experience a semidiurnal tidal pattern consisting of two high tides and two low tides every day. However, a few coastal areas have diumal tides consisting of one high tide and one low tide every day. High tides become especially pronounced during the full moon and the new moon and are called spring tides.

Explanation / Answer

Tide have never changed it’s action of rise and fall of surface level of water bodies under the influence of the gravitational force of sun and moon on the earth. Presently most of the coastal areas experiences diurnal tides of high and low one and it’s more prominent during the full moon and during the new moon. It has been found that during the pre historic period tides were almost 3 times higher as that of today this is been concluded from the studied and the explanation for this is given that in the prehistoric period their were lack of continental shelf where as in the present time it’s available this self part played an major role in dissipating the tidal energy before reaching to the shoreline.

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