Why do rivers flow to the sea?
Gravity's Downhill Map
Why do rivers flow to the sea?
Every river on Earth — from the mighty Amazon to the creek behind your house — is on a journey to the ocean. They twist through forests, carve canyons, rush over falls, but they all end up in the same place. What's pulling them there?
The answer is gravity. Gravity is the force that pulls everything toward the center of the Earth — it's why dropped keys hit the floor, why rain falls down instead of up. Water obeys that same pull, always flowing from higher ground to lower ground.
