claim: Cordilleran Ice Sheet was located in North America.
evidence: Orographic lift occurs when an air mass is forced from a low elevation to a higher elevation as it moves over rising terrain .. air mass. air mass. elevation. elevation. terrain. terrain. As the air mass gains altitude it quickly cools down adiabatically , which can raise the relative humidity to 100 % and create clouds and , under the right conditions , precipitation .. air mass. air mass. altitude. altitude. adiabatically. Adiabatic cooling. relative humidity. relative humidity. precipitation. precipitation ( meteorology )