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AlfWegener
Every time a volcano erupts, the magma always cools down and turn into igneous rocks. Metamorphic rocks are created underground due to heat, pressure and time. The production of these rocks will always continue unless an extreme phenomenon causes all volcanoes to go dormant forever and the earth's crust disappears. Lol

Answer: Because the rocks keeps on changing.

Explanation: The rock cycle can change igneous rock into sedimentary rock  or metamorphic rock.

sedimentary rocks can get converted into metamorphic rock or in igneous rock.

Even the metamorphic rock can get converted into igneous or sedimentary rock.

So, sedimentary rock will never be in its original form it will keep on changing.