Answer:
between 20,000 and 25,000
Thats me also pay attention in school
When the organism dies in a moist or wet area the organism gets covered in mud and the mud hardens like a rock.
Waves erode a beach by pressing continually against them, right? I have heard of this happening many times. What the people do is build a small trench around the outside of the beach so the waves filter down into it, then back out instead of washing up against the sand. The other thing they do is wait a couple years for the beach to go down, then they put in new sand during the winter.
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