Take your best guess
A) Popping a cold pack to put on your head to sty cool __________
B) Bursting a hot pack to release heat and place it on a wound __________
C) Lighting a match is an __________.
D The Sun (surroundings) warming up the cold water in Lake Superior (system) __________
E) Combustion of gasoline in a car engine is an __________
F) Photosynthesis __________
G) A baking soda volcano __________