9. which economic activity is best described as requiring
high-skilled or knowledgeable people?
a. primary
b. quaternary
second
c. secondary
d. tertiary

B

Explanation:

The Quaternary sector is the part of the economy that is also sometimes described as the knowledge economy because it includes education activity.

Quaternary sector activity is measures, for example, by the presence and influence of higher education centers, foreign exchange students, research and investigation labs, think tanks, and innovation and entrepreneurship present in an economy.

Advanced technology is also an important aspect of the Quaternary sector that has only grown more important with time.

the correct answer would be true friction causes the faults to slip or collide