What Is Unique About the Pluto-Charon System, Compared with All

question 142

Multiple Choice

What is unique about the Pluto-Charon system, compared with all other planets and dwarf planets in the solar system?

• A) Both Pluto and Charon are volcanically active, with lava flows and vents of sulfur dioxide gas.
• B) Charon is an icy moon, but it is in orbit around a giant planet made mostly of liquid hydrogen.
• C) Pluto has only one satellite.
• D) Both Pluto and Charon are in synchronous rotation, so each object maintains the same face toward the other object at all times.

---

Definitions:

Consumption Expenditures

The total amount spent by households on goods and services for their own use, not including savings or investments.

Households

Economic entities (of one or more persons occupying a housing unit) that provide resources to the economy and use the income received to purchase goods and services that satisfy economic wants.

Product Market

The marketplace where final goods or services are offered to consumers, businesses, and the public sector.

Circular Flow Model

An economic model depicting the continuous, circular flow of goods, services, and money between households and businesses in an economy.