Why are there gravel beaches? In thousands of years of waves crashing on the beach shouldn’t all the gravel have become sand?

Question

Why are there gravel beaches? In thousands of years of waves crashing on the beach shouldn’t all the gravel have become sand?

In: 6381

Answer 1

Not all beaches have been where they are for thousands of years. Somewhere you need hundred year old beaches too or you can never have thousand year old beaches.