How Has the Age of Mercury's Intercrater Plains Been Estimated

question 150

Multiple Choice

How has the age of Mercury's intercrater plains been estimated?

• A) from residual radioactivity within the plains compared to areas outside, as measured by the Mariner 10 spacecraft
• B) by comparing the albedo of the plains to areas outside because material becomes lighter as it gets older, as it does on the Moon
• C) from radioactive dating of rocks returned to Earth by the Mariner 10 spacecraft
• D) by comparing the number of craters per unit area within the plains to areas outside

---

Definitions:

Thomas Paine

An influential political activist and writer whose works, including "Common Sense," contributed to the American Revolution.

New Government

The establishment of a new system of political authority, often following a revolution, reform, or major political change within a country.

First Continental Congress

A gathering of delegates from twelve of the Thirteen Colonies in 1774, which met to address grievances against British policies and to organize colonial resistance.

King George III

The monarch of Great Britain and Ireland during the late 18th century, notably during the American Revolutionary War.