In a high-pressure system,
a. air molecules are far apart and pressing on earth���s surface.
b. air molecules are far apart and rising away from earth���s surface.
c. air molecules are close together and pressing on earth���s surface.
d. air molecules are close together and rising away from earth���s surface.

Extensive and unusual cold snaps have occurred here recently. is this evidence that global warming is lessening or not occurring? no—although the long-term trend is for warming, short-term weather patterns can still be variable. no—melting of glaciers and ice caps is making the oceans cooler, which can cause cold snaps. yes-- if global warming really were occurring, cold snaps wouldn’t happen. yes—due to global warming, weather patterns should be become less—not more—variable.