Combustion=heat and light
decomposition=taking something away
single means one element changes
and double means two elements change l.
Answer:
Hornfels most commonly form in the aureole of granitic intrusions in the upper or middle crust. Hornfels formed from contact metamorphism by volcanic activity very close to the surface can produce unusual and distinctive minerals.
In an experiement things that are changing are called variables.
The correct answer is the one in the middle. Mixing food coloring and water
