Which of these could be considered models? Check all that apply. a drawing of Earth’s rock layers
a digital measuring tool
a computer design of a space shuttle
a 3-D representation of a volcano
a rover on the surface of Mars
HELP PLSS

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.