Earth and Its Neighbors 2
Before You Read 2
Earth and Its Neighbors 6
Section 1:Astronomers Make Discoveries 8
Section 2:Astronomers Discovered the Solar System 14
genre Using a Web Site Facts About Earth 18
After You Read 28
Glossary 30
Our Solar System 32
Before You Read 32
Our Solar System 36
Section 1:The Sun 37
Section 2:The Inner Planets 38
Section 3:The Outer Planets 41
Section 4:Earth in Space 44
genre Using a Web Site Other Planets Have Seasons Too 50
Section 5:Why Planets Orbit the Sun 52
After You Read 58
Glossary 60
Exploring Our Solar System 62
Before You Read 62
Exploring Our Solar System 64
Section 1:Looking at Earth 65
Section 2:The Solar System Orbits the Sun 70
Section 3:The Inner Planets 72
Section 4:The Outer Planets 78
genre Using a Web Site The Hale-Bopp Comet 84
After You Read 88
Glossary 90
Making Matter Change 92
Before You Read 92
Making Matter Change 96
Section 1:Physical and Chemical Changes 98
Section 2:Bringing Matter Together 100
Section 3:Taking Matter Apart 106
genre Reading an Encyclopedia Entry Solar Still 110
Section 4:Comparing Changes 114
After You Read 118
Glossary 120
Changing Matter 122
Before You Read 122
Changing Matter 126
Section 1:Chemical Changes 127
Section 2:Physical Changes 130
Section 3:Reversing Changes in Matter 134
genre Reading an Encyclopedia Entry Centrifuge 138
Section 4:Making Matter Change 142
After You Read 148
Glossary 150
Compounds and Mixtures 152
Before You Read 152
Compounds and Mixtures 154
Section 1:Matter Can Change Chemically 155
Section 2:Matter Can Change Physically 166
genre Reading an Encyclopedia Entry Oil Spill 174
After You Read 178
Glossary 180