In a gas, which quantities relate in such a way that when one increases, the other decreases

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Acontrol during an experiment. might change remains constant does not exist does change

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?