Which is true about the total mechanical energy in a closed system?
o
a. it is not conserved.
o
b. it is zero.
o
c. it does not change.
o
d. it is always decreasing.

Can smoke be transformed into liquid or used as energy or both?

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

What is i fracture in the crust called when land move up, down or sideways