Which of the following statements best describes chemical weathering?
a. it always results in dome-shaped formations.
b. it happens only in cool environments.
c. it's the process by which rocks and minerals undergo changes in their composition.
d. it's the type of weathering in which rocks and minerals break down into smaller pieces.

Chemical weathering is the type of weathering in which rocks and minerals break down into smaller pieces. The correct option among all the options given in the question is option "d". Weathering can be of two types and they are physical and chemical weathering. Sometimes with these type of weathering a biological phenomenon can get added. 

Probably north korea if your family has decided to use only nuclear power.