Transcript Chapter 21

CHAPTER
NEW CHAPTER
Our Solar System
the BIG idea
Planets and other objects form a system around our Sun.
21.1 Planets orbit the Sun at different distances.
21.2 The inner solar system has rocky planets.
21.3 The outer solar system has four giant planets.
21.4 Small objects are made of ice and rock.
CHAPTER OUTLINE
CHAPTER RESOURCES
21.1
CHAPTER HOME
KEY CONCEPT
Planets orbit the Sun at different distances.
The planets have different sizes and distances from the
Sun.
VOCABULARY
astronomical unit
(AU)
ellipse
inner solar system
Mercury, Venus,
Earth, Mars, asteroids
outer solar system
Jupiter, Saturn, Uranus,
Neptune, Pluto, comets
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CHAPTER
RESOURCES
SECTION
OUTLINE
21.1
KEY CONCEPT
CHAPTER HOME
Planets orbit the Sun at different distances.
The planets have different sizes and distances from the
Sun. The solar system formed from a disk of dust and
gas. Massive objects became round.
VOCABULARY
astronomical unit
(AU)
ellipse
CHAPTER
RESOURCES
SECTION
OUTLINE
21.2
CHAPTER HOME
KEY CONCEPT
The inner solar system has rocky planets.
• The terrestrial planets are round and have layers.
• Atmospheres came from volcanoes and impacts.
• Four processes produce surface features.
VOCABULARY
terrestrial planet
tectonics
volcanism
tectonics
volcanism
CHAPTER
RESOURCES
weathering and
erosion
impact cratering
SECTION
OUTLINE
21.3
KEY CONCEPT
CHAPTER HOME
The outer solar system has four giant
planets.
• The gas giants have very dense, deep atmospheres
with layers of clouds.
• All four giant planets have ring systems.
VOCABULARY
gas giant
ring
CHAPTER
RESOURCES
Close-up of Saturn’s rings
SECTION
OUTLINE
21.4
KEY CONCEPT
CHAPTER HOME
Small objects are made of ice and rock.
• Objects in the inner solar system are rocky.
• Pluto and most other objects in the outer solar system
are made of ice and rock.
• Rocky asteroids and icy comets orbit the Sun and
produce tiny fragments that may become meteors.
VOCABULARY
asteroid
comet
meteor
meteorite
CHAPTER
RESOURCES
The asteroid Eros
SECTION
OUTLINE
21.1
KEY CONCEPT
CHAPTER HOME
Planets orbit the Sun at different distances.
I. Planets orbit the Sun at different distances.
A. Planets have different sizes and distances.
1. Distances
VOCABULARY
astronomical unit
(AU)
ellipse
2. Orbits
B. The solar system formed from a swirling cloud of
gas and dust.
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
21.2
CHAPTER HOME
KEY CONCEPT
The inner solar system has rocky planets.
II. The inner solar system has rocky planets.
A. The terrestrial planets have rocky crusts.
1. Processes and Surface Features
2. Atmospheres
VOCABULARY
terrestrial planet
tectonics
volcanism
B. Craters cover the surface of Mercury.
C. Volcanoes shape the surface of Venus.
D. Erosion changes the appearance of Mars.
1. Surface of Mars
2. Gases and Water on Mars
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
21.3
KEY CONCEPT
CHAPTER HOME
The outer solar system has four giant
planets.
III. The outer solar system has four giant planets.
A. The gas giants have very deep atmospheres.
VOCABULARY
gas giant
ring
B. Jupiter is a world of storms and clouds.
C. Saturn has large rings.
D. Uranus and Neptune are extremely cold.
1. Uranus
2. Neptune
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
21.4
KEY CONCEPT
CHAPTER HOME
Small objects are made of ice and rock.
IV. Small objects are made of ice and rock.
A. Pluto and most objects in the outer solar system
are made of ice and rock.
VOCABULARY
asteroid
comet
meteor
1. Pluto and Charon
meteorite
2. Moons of Gas Giants
B. Asteroids and comets orbit the Sun.
1. Asteroids
2. Comets
3. Meteors and Meteorites
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY
CHAPTER HOME
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