目錄
l.Plants
Photosynthesis
Roots
Stems
Leaves
Flowers
Petals
Pollination and Fertilization
Fmit
Scattering of Seeds
Other Ways of Growing Plants
Plants fbr Food
Raw Materials from Plants
Drugs from Plants
Summary
2.Light
The Nature of Light
Behavior of Light
Reflected Light
Bending Light
Using a Lens
Light and Color
Colors in Sunlight
Seeing Colors
Colored Lights
How We See?
Seeing
Eye
Summary
3. Solar System
Our Star----Sun
Solar Eclipse
Members of the Solar System
Mercury
Venus
Earth
Mars
Jupiter
Satum
Uranus
Neptune
Pluto
Space Objects of a Different Kind
Asteroids
Comets
Meteoroids
Summary
4. Minerals, Rocks, Fossils
Minerals
Identifying Minerals
Taste and Touch
Hardness
Streak
Luster
Crystals
Rocks
Igneous Rock
Sedimentary Rock
Metamorphic Rock
Ore
Fossils
Fossil Types
Geologic Time Clocks
Summary
5. Adaptation for Survival
Body Coverings
Feathers
Skin
Scales
Fur
Shells
Body Parts
Wings
Claws
Protective Coloration
Animal Behavior
Reflex
Instinct
Social Behavior
Leamed Behavior
6.Sound
Hearing Sound
Volume and Sound
Using Sound
Reflected and Absorbed Sounds
Different Sounds
Sounds You Cannot Hear
Summary
7. Ocean
The Ocean Around Us
Oceans and Climate
Recipe for Ocean Water
Waves
Tides
Currents
The Ocean Bottom
Shelf
Slope
Plain
How People Use the Ocean
Fishing
Underwater Bonanza
Shopping in the Ocean
Energy
Transportation and Communication
8.Magnets and Electricity
Magnets
Magnetic Poles
Magnetic Field
Electricity
Static Electricity
Current Electricity
Measuring Electricity
Current from Magnets
Use and Control
Using Electricity
Magnets from Electricity
Sununary
9.Human Body Structure
Cells
Tissues
Organs
Systems
Circulatory System
Skeletal System
Muscle System
Digestive System
Respiratory System
Excretory System
Nervous System
Body Care
Exercise
Proper Diet
Proteins
Carbohydrates
Fats
Vitamins
Minerals
Water
Basic Food Groups
Sleep
Cleanliness
l0 Changes in Matter
Matter
Why Do Chemists Study Changes?
What Is the World Made of?
What is Air?
What Can Buming Tell Us about a SubstanceY
What Can Boiling Tell Us about a Substance?
What Happens When Things Dissolve?
How Are Solids Made from Solutions?
How Can We Explain Physical Changes?
How Can We Explain Chemical Changes?
Summary
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