The Blue Planet: 10 Ocean and Geography Questions

Explore ocean depth, the Pacific's scale, freshwater records, and why one world ocean has five familiar names.

Choose one answer per question. There’s no timer. You can skip a question; unanswered questions count as incorrect.

QUESTION 01About what share of Earth's surface is covered by the ocean?

31%51%71%91%

QUESTION 02What percentage of Earth's water is in the ocean, approximately?

Less than 10%About 35%About 65%More than 97%

QUESTION 03Which named ocean basin is the largest?

Atlantic OceanPacific OceanIndian OceanArctic Ocean

QUESTION 04Which named ocean contains Challenger Deep?

PacificAtlanticIndianArctic

QUESTION 05Which trench contains Challenger Deep?

Peru-Chile TrenchJava TrenchMariana TrenchPuerto Rico Trench

QUESTION 06About how deep is Challenger Deep by NOAA's cited measurement?

1,000 meters4,000 meters7,000 meters10,935 meters

QUESTION 07Which is the newest commonly recognized of the five named ocean regions?

ArcticAtlanticSouthernIndian

QUESTION 08Scientifically, how many connected global oceans are there?

OneThreeFiveSeven

QUESTION 09Which lake has the largest surface area of any freshwater lake?

Lake MichiganLake BaikalLake SuperiorLake Victoria

QUESTION 10How do satellites help scientists estimate the shape of the seafloor?

By photographing every trench directlyBy detecting subtle sea-surface height changesBy sampling rocks from orbitBy measuring fish populations

Keep your curiosity going.