An experiment is set up in a lab. Three different
materials - copper, iron, and glass are all placed
with one end of each rod in a pan of hot water.
Each rod has an equivalent amount of wax on the
opposite end. After a few minutes, each of the
wax beads have melted at different times.

What is the dependent variable in the
experiment?


A.time
B.rate of convection
C.rate of radiation
D.rate of conduction