Answers2627 EARTH SPACE SCIENCE AGravity and Motion

Gravity and Motion — Unit test Answers

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21
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Which is a type of star system?

A
dim stars
B
solar system planets
C
wobbling stars
D
globular clusters
22
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Observable matter makes up about what percentage of the universe?

A
5%
B
10%
C
50%
D
95%
23

Which statement correctly describes terrestrial planets?

A
They are made of mostly rock.
B
They are made of gases.
C
They are small objects of ice and dust.
D
They are very large compared to other planets.
24

What term describes the moon’s path around Earth?

A
eclipse
B
phase
C
revolution
D
rotation
25

What term generally describes small chunks of rocks and debris in space?

A
meteorites
B
meteoroids
C
meteors
D
meteorides
26

What was discovered in 1965 and is believed to be leftover thermal energy from the big bang?

A
red shift
B
the Eagle Nebula
C
the Doppler effect
D
background radiation
27

Lori attended a lecture about the Sun, and the presenter had placed this image on the wall. Which layer of the Sun could this image be referring to?

Question illustration
A
the convection zone, because it shows how energy moves in a convection current
B
the radiation zone, because it shows how energy is transferred through radiation
C
the core, because it shows how the Sun creates energy through the process of nuclear fusion
D
the chromosphere, because it shows how energy is emitted by the atmosphere of the Sun
28

What force acts between Earth and the moon?

A
gravity
B
mass
C
motion
D
newtons
29

What is the Milky Way?

A
a spiral galaxy in which Earth is located
B
an elliptical galaxy in which Earth is located
C
an irregular galaxy in which Earth is located
D
the closest galaxy to the one in which Earth is located
30

What is the correct order of star colors from hottest to coolest?

A
white, yellow, red, blue
B
yellow, orange, white, red
C
red, orange, yellow, blue-white
D
blue, white, yellow-white, orange
31

What occurs when Earth’s shadow covers the moon?

A
neap tide
B
spring tide
C
solar eclipse
D
lunar eclipse
32

Which remains the same as the distance of an object from Earth changes?

A
size of the force
B
strength of gravity
C
mass of the object
D
weight of the object
33

In which direction does Earth rotate?

A
eastward around its axis
B
in an ellipse around the Sun
C
counterclockwise around the Sun
D
from north to south around its axis
34

Which causes objects in the universe to resist a change in speed or direction?

A
gravity
B
inertia
C
motion
D
orbit
35

Which is a factor that keeps Earth in orbit around the Sun?

A
the orbital path of the moon
B
the gravitational pull of the Sun
C
the continuous motion of the universe
D
Earth’s changing speed and direction
36

Why are there two high tides a day about 12 hours apart from each other?

A
Earth revolves around the Sun once during that time.
B
Earth rotates entirely on its axis once during that time.
C
The moon revolves around Earth once during that time.
D
The moon’s orbit is in line with Earth’s orbit twice a day.

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