Earth & weather
Storms, quakes, wind and water: the planet in motion. 30 ready to play, 11 coming soon.
What causes wind
Warm the land, cool the sea, and a breeze appears.
Why the sky is blue
Shine sunlight through the air and watch blue light scatter everywhere.
How volcanoes form and erupt
Build up the pressure under the crust and pop the cork.
What causes a tsunami
Jolt the seafloor and chase a wave across an ocean.
What causes climate change
Thicken Earth's blanket and watch the heat pile up.
How the water cycle works
Ride one drop from the sea to a cloud to a river and back.
What causes earthquakes
Push two plates until they slip, then feel the waves arrive.
How tornadoes form
Twist the winds inside a storm until a funnel touches down.
What causes tides
Drag the Moon around Earth and watch the oceans bulge.
How rainbows form
Shine the Sun through a raindrop and split white light apart.
How fossils form
Bury a fish in mud and fast-forward a million years.
How the Grand Canyon formed
Let a river cut through rock, layer by layer, for millions of years.
What causes fog
Cool the air until it can't hold its water, and a cloud sits on the ground.
Why ice floats
Freeze water and watch its molecules lock into an airy honeycomb.
How snowflakes form
Grow a six-armed crystal from one speck of dust in a cold cloud.
What if Yellowstone erupted?
Peek into the magma under the geysers and size up the real risk.
How wildfires start
Mix heat, fuel and air, add wind, and watch a spark run.
How hail forms
Toss an ice pellet up and down a storm and grow it layer by layer.
What causes ocean waves
Blow wind across the sea and watch energy roll to the shore.
Why it rains
Grow a cloud droplet a million times until it falls.
How recycling works
Sort, shred, melt and remake: follow a bottle's second life.
Why the ocean is salty
Follow rain as it carries rock salt down rivers into the sea.
Why the ocean is blue
Dive down and watch red light vanish first.
How clouds form
Lift warm air until its water vapour turns into floating droplets.
How salt melts ice
Sprinkle salt and make freezing much harder for water.
How trees grow
Add a new ring every year and lift water 100 metres high.
What causes ocean currents
Follow the great ocean conveyor belt around the world.
How sedimentary rocks form
Stack sand, mud and shells into stone over millions of years.
How the carbon cycle works
Follow a carbon atom from air to tree to ocean and back.
How igneous rocks form
Cool melted rock fast or slow and see different crystals grow.