How can we help?

You can also find more resources in our Help Center.

12 terms

Astro- Ch. 21 The Moon and Mercury: Comparing Airless Worlds Quiz 1 of 2

Manheim Township Astronomy: The Solar System and The Universe
STUDY
PLAY
tidally coupled
The locking of the rotation of a body to its revolution around another body through gravitational forcing. (also known as spin orbit lock)
terminator
The dividing line between daylight and darkness on a planet or a moon.
limb
The edge of the apparent disk of a body, as in "the limb of the moon."
maria
The lunar lowlands filled by successive flows of dark lava; from the Latin word for sea. (singular "mare").
sinuous rille
A narrow, winding valley on the moon caused by ancient lava flows along narrow channels.
ejecta
Pulverized rock scattered by meteorite impacts on a planetary surface.
rays
Ejecta from a meteorite impact, forming white streamers radiating from some lunar craters.
secondary crater
A crater formed by the impact of debris ejected from a larger crater.
multiringed basins
Very large impact basin in which there are concentric rings of mountains.
micrometeorites
Meteorite of microscopic size. These meteorites are especially important for airless worlds as they produce regolith (ex: the moon).
relative age
The age of a geological feature referred to other features. For example, relative ages reveal that the lunar maria are younger than the highlands.
absolute ages
An age determined in years, as from radioactive dating.

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com.
Click to see the original works with their full license.