A. the amount of <span>silica in the magma
Hope that helps.</span>
Explanation:
just me or is the picture not showing up :/?
1.weathered materials from rocks and transported to the beach through wind and rivers
2.from rocks weathering and eroding over thousands and millions of years.
Attrition - rocks smashing into each other and breaking down becoming smaller and smoother
Abrasion - rocks that are in the river wearing down the banks and river bed
Solution - soluble particles dissolving
Hydraulic Action - when there are cracks in the banks / cliffs, water can push air into them which creates pressure causing the cracks to get bigger
Hope this is what you wanted and I hope it helps. :)