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when heat is applied to metal tools, the metallurgy of the tool can change, causing the metal to become __?
(id:99709)
a. harder
b. softer
clear my choice

Explanation:

When heat is applied to metal tools, the process of annealing (heating and then cooling slowly) can occur. Annealing makes the metal softer by reducing internal stresses and changing its crystal structure. Hardening processes (like quenching) make metal harder, but the question is about the general effect of heat application in a metallurgy - related context where softening (due to annealing - like processes) is a common outcome.

Answer:

B. softer