1. Beneath the earth's surface it is hot enough to melt rock. What do you think happens to rock when you melt it?
a) It becomes less dense
b) It becomes more dense
c) Density doesn't change
2. We call melted rock magma(when it is beneath earth's surface) or lava(when it erupts on earth's surface). Rocks can only melt somewhere beneath earth's surface, where it is hot. Explain how lava ends up on earth's surface? (Hint: think about density and use your answer to #7 as a guide).
3. A sample of substance A weighs 5 lbs. A sample of substance B weighs 10 lbs. Which of the following statements HAS TO BE TRUE?
a) Sample A is more dense than sample B
b) Sample B is more dense than sample A
c) Sample A and B could have the same density if sample A is larger.
d) Sample A and B could have the same density if sample B is larger.
Explain in your own words: