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Rocks are worn away through the process of weathering and erosion. Weathering is the breaking down of rocks into smaller pieces while erosion is what carries the rock to new places. Rocks can be worn away by water, ice, and wind. Examples of this are abrasion, ice wedging, and dissolution.
Erosion
As slate is a metamorphic rock, it can't be worn easily. I t would be harder to wear than igneous or sedimentary rocks.
Sedimentary rocks can change to igneous rock when it goes through the rock cycle so a sediment can move to igneous rock where there is a volcanic activity happens making the the sediment get heat and pressure that makes igneous rock.So when you do the rock cycle you can go from igneous rock to a metamorphic rock.
It gets worn away by the sea because it is simply eroded which mean when water is moving fast the waves crash against the rock and bits fall off into the sea. when this happens the waves carry the pieces of rock away and they end up on a beach as sand or at the bottom of the ocean.
Erosion
Detrital rocks are formed from sedimentation of loose particles of rocks that are worn away from rocks from a different location.
When its worn away...its called erosion
Rocks wear away because slowly,wind/water take away tiny pieces of dust and slowly it gets worn away.
"erosion"
Weathering is the erosion of certain types of rock whereby the surface of the rock is worn away by wind and water. The worn away material bonds together to form sedimentary rock.
When sedimentary rocks are weathered and eroded, they turn into sediments. And after compaction and cementation of the sediments, it will turn back into sedimentary rock.