When Researchers Followed a Large,representative Sample of U

question 51

Multiple Choice

When researchers followed a large,representative sample of U.S.youths from ages 9 to 17,they found that __________.

• A) two-thirds of all students receive physical education in high school
• B) daily free-time physical activity declined with age, more so for girls than boys
• C) a majority of participants engaged in regular exercise outside of school hours
• D) half of all students experienced a daily physical education class in high school

---

Definitions:

Igneous Intrusion

The process and resultant feature where magma cuts through pre-existing rock layers, cooling and solidifying underground.

Anticline

A geological feature characterized by a convex fold in rock layers that arches upward, often associated with oil reserves.

Syncline

A geological fold with layers that dip inward from both sides towards the central axis, typically forming a trough.

Monocline

A geological fold in which all strata are inclined in the same direction, forming a step-like structure.