What can you see on the surface of the bond paper?

Is it on the Activity 5? "drop it like a hot spot'' .

In the activity "Drop it Like its "hot spot", it can be seen that the surface of the paper which is directly in contact with the test tube became wet considering that the paper represents the earth's crust and the water is the magma coming from the earth's . 

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.