A Compass Would Be Useful to an Astronaut Lost on the Moon

Q39: The moon formed from debris blasted out

Q40: As meteors enter the Earth's atmosphere, large

Q41: _ is the most volcanically active object

Q42: The Earth is but one of eight

Q43: Jupiter, Saturn, Uranus, and Neptune are surrounded

Q45: Perhaps the most obvious of _ surface

Q46: As planetismals struck the growing Earth, their

Q47: Venus and Earth have _ surfaces and

Q48: The inner planets are sometimes called the

Q49: The giant meteor impact at the end