Expert skiers and snowboarders use such terms as black ice, corn, powder, packed powder, and so on to describe differing snow and ice conditions. they do this in order to perceive the environment in a particular way and to avoid life-threatening situations. many social scientists would argue that this is an example of:

This paragraph is a clear example of the Adaptation Theory.

Explanation:

The adaptation theory says that human has the ability to adapt and change according to the environment in order to survive. In the paragraph, the skiers adapt their vocabulary in order to have a better understanding of the dangers that skiing and snow can bring.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.