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trash
I very much think they might be 2 cm!
The ocean pieces are regular jigsaw pieces, which are between 1 - 2 inches each side. The countries pieces are between a half inch to 3 inches each side The smaller countries are combined to abide by safety standards. The larger countries are cut along the borders, but split into 2 or more pieces, so they don't break.
it depends on the type of stone and how big the pieces are it will all be different
One cubic yard of gravel typically occupies a space of about 27 cubic feet. When piled, it generally forms a mound that's about 3 feet high and covers an area of roughly 9 square feet, depending on the shape and compaction of the pile. The exact dimensions can vary based on the size and shape of the gravel particles.