Pre-Kindergarten
All Pre-Kindergarten lessons ›Kindergarten
All Kindergarten lessons ›Animal Homes
Animals
Caring for Our Earth
Our World
How Things Move (Push & Pull)
Motion
Kinds of Weather
Weather
Push & Pull
Forces
Sunlight & Warmth
Energy
Sunlight & Warmth
Sun & Sky
Taking Care of Our Earth
Caring for Nature
Weather & What to Wear
Weather
What Living Things Need
Living Things
Grade 1
All Grade 1 lessons ›Animal Body Parts
Animals
Animal Body Parts
Animals
Baby Animals & Their Parents
Animals
Baby Animals & Their Parents
Animals
Day & Night
Sky & Space
Day & Night
Sky Patterns
Living & Nonliving Things
Living Things
Plant Parts
Plants
Plant Parts & Their Jobs
Plants
The Four Seasons
Weather & Seasons
Grade 2
All Grade 2 lessons ›Animal Life Cycles
Life Science
Earth’s Land & Water
Earth Features
How Seeds Travel
Plants
Living & Nonliving Things
Life Science
Plants Need Sunlight & Water
Plants
Properties of Materials
Materials
Seed Dispersal & Pollination
Plants
Sink or Float
Matter
States of Matter
States of Matter
What Living Things Need
Life Science
Grade 3
All Grade 3 lessons ›Animals & Their Habitats
Upper Elementary
Food Chains & Energy Flow
Upper Elementary
Forces & Motion
Upper Elementary
Forces: Push & Pull
Forces
Habitats & Survival
Ecosystems
Life Cycles
Life Cycles
Light & Shadows
Upper Elementary
Magnets
Forces
Magnets & Magnetism
Upper Elementary
Plant Life & How Plants Grow
Upper Elementary
Rocks & the Rock Cycle
Upper Elementary
Simple Machines
Upper Elementary
Sound & Vibrations
Upper Elementary
States of Matter
Upper Elementary
The Human Body: Body Systems
Upper Elementary
The Solar System
Upper Elementary
Volcanoes
Upper Elementary
Weather & Climate
Upper Elementary
Weather & Seasons
Weather
Grade 4
All Grade 4 lessons ›Energy & Speed
Energy
Energy: Forms & Transfer
Energy
Fossils & Rock Layers
Earth History
Light & How We See
Light
Natural Resources
Natural Resources
Plant & Animal Structures
Structures & Survival
Simple Circuits
Electricity
Sound & Vibrations
Sound
The Five Senses & Your Brain
Life Science
Weathering & Erosion
Earth Changes
Grade 5
All Grade 5 lessons ›Earth's Four Spheres
Earth Systems
Earth’s Four Spheres
Earth Systems
Ecosystems & Food Webs
Ecosystems
Gravity
Forces
Matter & Particles
Matter
Mixtures & Solutions
Matter
Physical & Chemical Changes
Matter
Properties of Matter
Matter
The Sun & Stars
Stars
Water on Earth
Earth Systems
Grade 6
All Grade 6 lessons ›Atoms & Molecules
Matter
Cells
Cells
Earth, Sun & Moon
Earth-Sun-Moon System
Earthquakes & Volcanoes
Tectonic Hazards
Fossils & Geologic Time
Earth History
Heat Transfer
Energy
Minerals
Earth Materials
Photosynthesis: How Plants Turn Sunlight Into Food
Middle School
Plate Tectonics
Earth Systems
Weather vs. Climate
Weather & Climate
Weathering & Erosion
Surface Processes
Grade 7
All Grade 7 lessons ›Adaptations for Survival
Adaptation
Cells & Cell Theory
Cells
Classification & Taxonomy
Classification
Energy Flow & the Energy Pyramid
Ecology
Genetics & Heredity
Genetics
Levels of Organization
Organization of Life
Natural Selection & Adaptation
Evolution
Photosynthesis vs. Cellular Respiration
Cells & Energy
Reproduction: Sexual & Asexual
Reproduction
Symbiosis & Ecosystem Interactions
Ecology
Grade 8
All Grade 8 lessons ›Chemical Reactions
Chemistry
Contact & Non-Contact Forces
Forces & Motion
Density
Properties of Matter
Elements, Compounds & Mixtures
Classifying Matter
Kinetic & Potential Energy
Energy
Newton's Laws of Motion
Forces & Motion
Physical vs Chemical Changes
Changes in Matter
Simple Machines
Work & Machines
The Periodic Table
Chemistry
Waves
Waves
Grade 9
All Grade 9 lessons ›Biomolecules
Biochemistry
Cell Division (Mitosis)
Cells
Cell Structure & Organelles
Cells
Cell Transport
Cells
DNA & Base Pairing
Genetics
Enzymes
Proteins
Evidence for Evolution
Evolution
Homeostasis
Body Systems
Meiosis
Cell Division
Protein Synthesis
Molecular Biology
Grade 10
All Grade 10 lessons ›Acids, Bases & pH
Acids & Bases
Atomic Structure
Atoms
Balancing Chemical Equations
Reactions
Chemical Bonding
Bonding
Gas Laws
Gases
Nuclear Chemistry & Half-Life
Nuclear Chemistry
Solutions & Molarity
Solutions
States of Matter & Phase Changes
Matter
The Mole & Molar Mass
Quantitative Chemistry
Types of Chemical Reactions
Reactions
Grade 11
All Grade 11 lessons ›Circular Motion & Gravitation
Mechanics
Electricity & Circuits
Electricity
Energy & Work
Energy
Forces & Newton's Second Law
Mechanics
Kinematics (Motion)
Mechanics
Magnetism & Electromagnetism
Electromagnetism
Momentum
Mechanics
Projectile Motion
Mechanics
The Electromagnetic Spectrum
Waves & Light
Thermodynamics & Heat Transfer
Thermal Energy
Grade 12
All Grade 12 lessons ›Biogeochemical Cycles
Earth Systems
Biomes
Biomes
Climate Change
Climate
Ecological Succession
Ecosystem Change
Ecosystems & Biodiversity
Ecosystems
Human Impact & Sustainability
Sustainability
Population Dynamics & Carrying Capacity
Ecology
Renewable & Nonrenewable Energy
Resources
Waste & Recycling
Resource Management
Water Resources & Pollution
Resources