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Flashcards covering the Earth, Moon, and Mercury.
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Earth has a , , and _.
Metal core, silicate mantle, and outer crust
Our planet's geology is dominated by _, in which crustal plates move slowly in response to mantle convection.
Plate tectonics
The atmosphere is composed primarily of and _.
N2 and O2
_ and _ in the atmosphere heat the surface through the greenhouse effect.
CO2 and methane
Earth has been influenced by the _, including such recent examples as Meteor Crater and the Tunguska explosion.
Impacts of cosmic debris
Recent spacecraft have found evidence of a ___ , most likely deposited by comet and asteroid impacts.
Small amount of water near the lunar poles
The Moon, like Earth, was formed about ___.
4.5 billion years ago
The ___ says that the Moon originated from the impact of a Mars-sized projectile with Earth 4.5 billion years ago.
Giant impact hypothesis
Mercury differs from the Moon in having a very large ___.
Metal core