Big-picture science lessons
We add new lessons every month
Earth's Crust
Upper Elementary
Is the ground constantly moving beneath your feet?
Earth's Layers
Lower Elementary
If you could dig to the center of Earth, what would you find?
Rest and Relaxation
Upper Elementary
Why do we sleep? What would happen if you didn’t?
The Nervous System
Upper Elementary
How fast is your reaction time? Can you make it faster?
Heart and Lungs
Lower Elementary
How do your heart and lungs connect and work together?
Senses and Information Processing
Upper Elementary
How can your own senses play tricks on your brain?
Muscles and Bones
Lower Elementary
What do you think it would be like if you didn’t have any bones?
Water Quality and Treatment
Upper Elementary
Where does the water you use every day come from?
The Water Cycle
Upper Elementary
Could we be drinking the same water that dinosaurs drank?
The Digestive System
Lower Elementary
Why do we poop? What’s actually happening inside our bodies?
Animal Research
Lower Elementary
Do dogs lay eggs, or do they give birth to live young?
Magnetic Fields and Navigation
Lower Elementary
How did people navigate the world before GPS?
Gravity and Weight
Upper Elementary
Do you weigh the same on the Moon as you do on Earth?
Magnetism
Lower Elementary
How could you move something without touching it?
Fluid Resistance and Drag
Upper Elementary
Why does it hurt so much when you do a belly flop into the water?
Friction
Lower Elementary
Have you ever tried sliding down a slide and suddenly stopped halfway?
Parts of a Leaf
Lower Elementary
Why do you think leaves have all those little lines?
The First Great Lesson
Lower Elementary
Where did the stars come from? And the Sun? How was our Earth created?
The Second Great Lesson
Lower Elementary
Where did life on Earth come from, and how has it changed the planet?
What Is Sound?
Lower Elementary
Can you hear sound? Can you feel it? Can you see it?
The Scientific Method and Lab Safety
Lower Elementary
Do you use the scientific method every day without realizing it?
Plant Nature Walk (Intro to Botany)
Lower Elementary
Can nature quietly sneak into the busiest parts of the city?
Erosion, Valleys, and Canyons
Upper Elementary
What happens when a river flows in the same place for millions of years?
Intro to the Work of Water
Lower Elementary
What do you and Earth’s surface have in common?
Foundations for the Work of Air
Lower Elementary
How do we know that air exists? What makes air move?
Our Solar System and Planetary Movement
Lower Elementary
Why don’t we float off into outer space? Why is a year 365 days?
Composition of Earth
Lower Elementary
If you could get to the center of Earth, what would you find?
Combining and Separating
Lower Elementary
Why does sand settle to the bottom of the ocean, but salt mixes in?
Crystallization
Lower Elementary
Can you tell the difference between sugar and salt without tasting them?
The Story of the Elements
Upper Elementary
How did people discover oxygen if they couldn’t see it?
Parts of a Plant
Lower Elementary
Can you name any parts of a plant you’ve eaten before?
Needs of the Plant
Lower Elementary
What does a plant need in order to grow healthy and strong?
How to Stop Erosion
Upper Elementary
Why do some places experience more erosion than others?
The Leaf Food Factory (Photosynthesis)
Lower Elementary
Can plants make their own food? How do you think they do it?
The River
Lower Elementary
Why are rivers so windy? Why don’t they flow straight?
Earth's Blanket
Upper Elementary
How does Earth stay warm? Why is Earth getting warmer?
Can Plants Move?
Lower Elementary
How do plants get what they need to survive? Can they move to find it?
Earth and Sun
Lower Elementary
Why does the sun rise and set every day? What if one day it didn’t?
Different Properties at Different Temperatures
Lower Elementary
What makes something change from a solid to a liquid to a gas?
Particle Behavior – Solids, Liquids, and Gases
Lower Elementary
How do states of matter apply pressure and makes their presence known?
How Did Humans Discover Fire?
Lower Elementary
When did we start using fire? What 3 things does fire need to burn?
Erosion from Rainfall
Upper Elementary
Have you ever seen a rock shaped just like a mushroom?
Parts of a River
Lower Elementary
What has a mouth but never talks? What has a bed but never sleeps?
Where Does the Wind Come From?
Upper Elementary
Who (or what) makes the wind? Do we need the wind?
When Light Hits a Sphere
Lower Elementary
Why is it always hotter in Brazil than it is in Antarctica?
Force Direction of Solids, Liquids, and Gases
Lower Elementary
What is force? Do we have force? Does matter have force?
Animal Nature Walk (Intro to Zoology)
Lower Elementary
What kinds of living creatures do scientists classify as animals?
Viscous and Fluid + Rigid, Elastic, and Plastic
Lower Elementary
What makes some solids squishy and some liquids sticky?
Coastal Erosion and Ocean Weathering
Upper Elementary
What do sand, sea glass, and peninsulas have in common?
More River Features
Lower Elementary
What do canyons and waterfalls have in common?
How to Crack a Boulder
Upper Elementary
What could be strong enough to crack a boulder?
Earth's Axis Tilt
Upper Elementary
Why does it get darker earlier during the winter? Why is it colder?
Effects of Moving Tectonic Plates
Upper Elementary
What makes the ground shake during an Earthquake?
Density
Lower Elementary
Why do some things float while other things sink?
Sedimentation
Upper Elementary
Why do some mountains have colorful stripes on them?
Air Pressure
Upper Elementary
If you put a balloon in the freezer, what do you think will happen?
A Quick Guide for Educators
Teacher Tools
A 5-minute tutorial on how to use Learn Libre lessons.