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

Mankiw attributes – chapter 1 and his 10 principles – differences in living standards within a countryover time and across countries at a moment in time to: a. the presence or absence of inflation and unemployment.b. the allocation of resources between private markets and the public sector.c. those that have dealt successfully with the efficiency v. equality tradeoff and those that haven’t.d. differences in productivity.e. ones that think at the margin and respond to incentives and those that don’t.