1.Which giant planet formed first?

2. According to the Nice theory where did the Kuiper
belt objects and Oort cloud objects come from?

3.List the layers of Earth’s atmosphere?

4.what is a tidal force? How do tidal forces produce
tides in Earth’s oceans?

5.Which pair of planets have atmospheres with the
most similar chemical compositions?
a. Earth andVenus,
b. Earth and Mars,
c. Venus and Mars,
d. Mercury and Mars,
e. Mercury and Venus

6.Compare the surfaces of Mercury and our Moon.
How are they similar? How are they different?

*7.Compare Venus’s continents with those on Earth.
what do they have in common? How are they different?

8.Which of the following planets does not have rings?
Choose only one.
a. Mars,
b. Uranus,
c. Neptune,
d. Saturn,
e. Jupiter

9.what is liquid metallic hydrogen?which planets
contain this substance?’What produces this form of
hydrogen?

10.wthy are Uranus and Neptune distinctly bluer than
Jupiter and Saturn?

11.Space debris that is a roughly equal mix of rock and
ice is called a(n): a. asteroid,
b. comet,
c. meteoroid,
d. meteorite,
e. meteor

12.Describe the different chemistries of the two tails
of a comet.

13.why do astronomers believe that the debris that
creates many isolated meteors comes from asteroids,
whereas the debris that creates meteor showers is
related to comets?