The "Blue Marble" was the name for:​

A) ​the first photograph of our planet from space
B) ​the first circumnavigation of the globe
C) ​the earliest version of Google Earth
D) ​an urbanization program associated with modernization

Blue Marble

A famous photograph of the Earth taken in 1972 by the Apollo 17 crew, symbolizing Earth's fragility and unity.

Circumnavigation

The action or process of sailing or otherwise traveling all the way around the entire planet, continent, or an island.

Urbanization

The process by which towns and cities are formed and become larger as more people begin living and working in central areas.