metaconglomerate and metabreccia rocks

abraded abrasion alteration altered angular background breccia changed chemical cobble conglomerate continental cooked crust deep earth environment erosion evidence extreme fine formation formed geologic geology grained hand hard heat inorganic interior large lithosphere matrix metabreccia metaconglomerate metamorphic modified natural nature next object particle particles pebbles physically piece pressure pressures quartz quartzite resource rock rocks rounded samples science sediment sharp sized small solidification solidified solution stone stones stream tough two weathered white