The major difference between real and nominal gdp is that real gdp
a) excludes government debt
b) excludes exports
c) is adjusted for price-level changes using a price index
d) measures only the value of intermediate goods and services that are consumed

C). Real GDP is adjusted for price level changes, whereas nominal GDP is not.

The GDP of a country measures the total value of all final goods and services produced within that country in a certain period of time (typically a year.)

Real GDP is based on nominal GDP, but takes changes in the overall price level into account as well. That's why the two indice are so similar, except for that the value of real GDP but not nominal GDP can be compared over a period of many year to show economic growth.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.