Will give Brainliest to correct the original source of all sand is:
beaches
oceans
rocks
rivers

The original source of all sand is rocks.

Hope I helped sorry if I didnt

answer is rocks

Explanation:

It’s rocks because all sand it Little Rock’s that have been smashed into smaller pieces over the years and decade, and that’s how rivers go sand to because some of the broke down rocks would fall into the river and eventually be carried in the ocean and washed in shore. And that’s how we got beaches

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure