Science Chapter 18 Test Notes Test Date: Wednesday, June 6
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1. A scientist that studies objects in
space studies astronomy.
2. Gravity keeps planets moving in
circular paths instead of straight lines.
3. Mercury is very hot in the daytime
and extremely cold during the nighttime because Mercury has no atmosphere to
hold the heat.
4. Mars is an inner planet with no
moons. It sometimes has huge dust storms that cover the entire planet.
5. The second planet from the Sun,
Venus, has an atmosphere of thick clouds that reflect the Sun’s light and make
it one of the brightest objects in the sky.
6. Pluto has a moon named Charon.
7. Uranus is different from the other
planets because it rotates on its side.
8. Life is possible on Earth because it
has an atmosphere and liquid water.
9. A storm that has been raging for
hundreds of years causes the Great Red Spot on Jupiter.
10.
The
rings around Saturn are made of water, ice, dust, and chunks of rock.
11.
Jupiter
has the greatest number of moons.
12.
Essay: Venus and Earth are two inner planets that
are about the same size. Both are
surrounded by an atmosphere, but life is found only on Earth. Give two reasons why life cannot exist on
Venus. (2 points)
Venus is surrounded by
a thick atmosphere of hot, poisonous clouds that would poison any living thing
on the planet. Venus is also too hot for
life as it exists on Earth because it is so close to the Sun.
13.
Compare
the size of Neptune with the other gas giant planets. Then compare the size of Neptune with all the
inner planets. (2 points)
Neptune is the smallest of the four
gas giant planets. Jupiter, Saturn, and
Uranus are all bigger than Neptune.
However, Neptune is bigger than all of the inner planets. About 60 Earths could fit inside Neptune.
Extra Credit
The outer planets are found
outside the asteroid belt in our solar system.
(4 points)
Part A:
Name the four gas giants that are outer planets and describe a feature
of each planet.
Part B: Name the one outer planet
that is not a gas giant. Explain what
makes this planet different from the other outer planets.
