Boiling Water is a physical change. When water gets to a certain temperature, it's boiling point starts.
To test if the hypothesis is correct, a good way is to think of it this way:
Density = mass/volume, right?
Calculate the mass and volume of each and do the equation; this will test your hypothesis.
You will be left with the density of each. But, make sure that the sample sizes are the same (controlled variable) otherwise it will be an unfair test.
It is letter C: Continental crust is thicker than oceanic crust.
Answer:
c I've taken chem 3 times
Explanation: