SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-earth-ocean-cover

About how much of Earth's surface does the global ocean cover?

About 71 percent of Earth's surface.

Start playing free

  1. About 29 percent
  2. About 71 percent ✔
  3. About 95 percent

Why: Earth looks blue from space because ocean covers most of its surface. The global ocean covers roughly seven tenths of the planet.

Huh, didn't know that: About 97 percent of Earth's water is contained in the global ocean.

The dad joke
Earth tried dry humor, but most of the surface stayed wet.
Like this card?
Play the game

References

Answer: About 71 percent. Earth looks blue from space because ocean covers most of its surface. The global ocean covers roughly seven tenths of the planet.

  1. Facts About Earth science.nasa.gov/earth/facts
    Earth's global ocean, which covers about 71% of the planet's surface
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Flying & DronesWhich gas makes up most of Earth's atmosphere?Flying & DronesWhat causes Earth's seasons?Flying & DronesWhen is Earth closest to the Sun in its yearly orbit?

That's stuff everyone should know.