I was walking by the beach and saw the pebbles around myself. I wondered why are there so many pebbles around the beach? What is the science behind it?
I dug a little deeper to find out what is the science behind finding so many pebbles on the beach, and trust me, it’s amazing to see how the shape of the coastline, the local geology and weather conditions are all the factors contributing to pebbles. That’s the reason why you see fine particles of sand on the beaches of Kovalam in Kerela and large boulders on the beaches of Vishakapatnam. The low energy environments like shallow estuaries or bays we see fine particles. While on the higher energy beaches, larger particles are seen.
Where did these pebbles came from in the first place?
We find several types of pebbles on the beach. Some are granite,, some are volcanic, non volcanic contains rock fragments.The obvious reason from where the stones have come from is the bedrock that is next to the beach. Since, every rock was a part of a bedrock before it was broken apart. About 14000 years ago, as the ice melted, the cuts the stones across the landscape in possible shapes and sizes whenever it slided through the bedrock. The stones that make up must have been a part of glacial deposit that has been washed by the ocean that we see today. IT takes years to build that rock and pebble sheet upon the beach. Now, the waves that is acting on the glacial deposit washed the sand and mud into the depth of the water leaving behind the stones or pebbles and sand.
Over the time as the rocks rolled up and down the beach, they became more rounded and polished that gave them their shapes. The solid bedrock is found at the end of the beach and the sheet of pebbles are found on the top.
It is astounding to know that the shape of the beaches changes continually as the dynamic waves are changing the shape of the rocks and pebbles around the beach. The largest storm might have configured the shape of the beach while the small ones takes place in a continual and gradual environment.So the next time you visit the sea beach, the shape of the bed rocks are not going to be the same as before! 😮
Did you know that the famous Marina Beach is the longest natural urban beach in India. It has been counted as the 11th longest in the world! With the total stretch of the beach is 13 kms it attracts as many as 30000 visitors per day. Even when bathing and swimming is forbidden at the beach it remains the most crowded beach in India.
Did you liked this fact related to beaches? Learn about the Types of Soil and soil profile. Click here to know why the sky is blue and other interesting facts.
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