Question

why do copper and aluminium change into sheets
when hammered ?​

Answer 1

Answer:

On hammering, change of metal into thin sheets is called malleability. It is the ability of a solid to bend or be hammered into other shapes without breaking. So, malleability is the ability of a metal to be hammered into thin sheets.

Answer 2

Answer:

because they have the melleability property in them which means that the substance can be break down into thin sheets