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The Earth and Moon always keep the same side towards each other.

The earth’s inner core is about the same temperature as the surface of the Sun.

Most lunar craters are volcanic in origin.

The density of Mars is very similar to that of the other terrestrial planets.

The lunar mare radioactively date back to 4.6 billion years, at the origin of the Moon, hence their dark color due to this aging.

The Sun’s tidal pull has slowed Mercury’s rotation down to __________ that of its year.

Which of these gases is the least abundant in our atmosphere?

Greenhouse gases in our atmosphere trap just enough heat to keep the earth’s oceans liquid.

Mars appears red in color because of refraction of light by its atmosphere, much like the color of the totally eclipsed Moon.

The _________ in our atmosphere is the result of photosynthesis by plants.