ZAP’S FACTS!
WONDERS

We have better maps of Mars than of our own ocean floor.

We have better maps of Mars than of our own ocean floor.

1 min read
We have better maps of Mars than of our own ocean floor.
THE FULL STORY

Sunlight, radio waves and cameras don’t travel well through deep water, so most of Earth’s seafloor is uncharted in detail. Meanwhile, satellites have mapped almost all of Mars’s surface.

The ocean is salty because rivers keep washing salt into it.
DID YOU KNOW? The ocean is salty because rivers keep washing salt into it. For billions of years, water has run off the land carrying minerals - and salt has nowhere to go. 2 min read
A tsunami can cross the entire Pacific in less than a day.
DID YOU KNOW? A tsunami can cross the entire Pacific in less than a day. In deep water it travels 500 mph - as fast as a jet plane. 2 min read
The Moon pulls the ocean toward it - which is what causes tides.
DID YOU KNOW? The Moon pulls the ocean toward it - which is what causes tides. Twice a day the sea rises and falls because Moon gravity is tugging on the water. 2 min read