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

A. It happens only in cool environments. 
B. It's the type of weathering in which rocks and minerals break down into smaller pieces. 
C. It always results in dome-shaped formations. 
D. It's the process by which rocks and minerals undergo changes in their composition

The statement that best describes chemical weathering is it is the process by which rocks and minerals undergo changes in their composition. The answer is letter D.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.