Respuesta :

calvinbakerr12

Answer:

Dating the ash layers above and below a sedimentary rock layer to determine its age is called bracketing. Radiometric dating uses the decay of unstable isotopes -- atoms with specific electrical charges -- to calculate something's age. ... Volcanic debris contains feldspar crystals, full of an isotope called potassium 40.

Explanation:
Because the ash builds up volcanic rock and it can also tell how old something is because of layers or how big something is that was once small but got covered in volcanic rock and ash.

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