BTB changing color is evidence for pic one A: matter movement
B: Matter change
C: Energy change
also it is because pick one
A:it detects the diff type of energy
B: it detects matter moving around from one place to another
C: it detects diff amounts of chemicals in the air

Bromothymol blue (BMB) is an indicator dye that turns yellow in the presence of acid. When

carbon dioxide is added to the solution, it creates carbonic acid, lowering the pH of the

solution. BMB is blue when the pH is greater than 7.6, green when the pH is between 6-7.6, and

yellow when the pH is less than 6

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

if you know your abc's you should be able to get your answer or just use google