Learn Oceanography Fast: 50 Ocean Flashcards on Depth Zones, Tides and Records

Deck QR5518, Oceans & Seas, is really a deck about the ocean: 50 cards cut from a general oceanography overview, heavy on numbers, depth zones and water physics. Despite the title, it names no individual sea; only card 19 explains what a sea is. Treat it as an ocean-science deck and it is excellent material.

Inside the 50 cards

You'll memorize: 70.8% ocean coverage, 361 million km², the five oceans (Pacific, Atlantic, Indian, Southern, Arctic), Challenger Deep, the Mariana Trench, average depth 3,688 m, 1.335 billion km³ of water, average salinity 3.5%, average temperature 3.9°C, sea ice at -2°C, the photic, mesopelagic, aphotic and hadalpelagic zones, the neritic and littoral zones, the bathyal zone, the abyssal plain, marine snow, thermocline, halocline, the mid-ocean ridge (65,000 km), Point Nemo, tidal range, the Bay of Fundy, wave shoaling, rogue waves, swell, ocean acidification and the origin of the word ocean (the Titan Oceanus).

Sample cards

How to study it

Sort the zones into two columns. The deck mixes two classification systems without saying so. Pelagic zones describe the water column: photic (0-200 m), mesopelagic or twilight, aphotic, hadalpelagic. Benthic and coastal zones describe the seafloor and shore: littoral (intertidal), neritic (over the continental shelf), bathyal (continental slope to ~4,000 m), abyssal plain (4,000-6,000 m), trenches. Write one vertical diagram with water on the left and bottom on the right; cards 29-31, 38-41 and 45 then become a single picture instead of eight loose definitions. Add the three "-clines" (thermocline, halocline, and pycnocline, which the deck omits) on the water side.

Fix three cards before you drill them.

• Card 20 asks When was Lake Superior's water formed? but answers about Earth's oldest water: 3.8 billion years, from pillow basalt in the Isua Greenstone Belt. Rewrite the front as "How old is the oldest evidence of liquid water on Earth?".
• Card 14 calls the photic zone "the depth at which light is 1%". That depth is the zone's lower limit; the photic zone is everything above it.
• Card 22 (26% of the seafloor mapped in high resolution, 2024) is a moving target: Seabed 2030 updates the figure every June, so date-stamp the card.

Group the statistics by ocean (area, share, volume, average depth) and learn them as one row per ocean; the Pacific's 46.6% of area vs 50.1% of volume is easier to keep when the two numbers sit side by side.

Related decks

The 65,000 km ridge links directly to our Volcanoes and Plate Tectonics guide, and for the freshwater side, see the world's largest lakes.

Look up deck QR5518 on Flip It and start with the zone diagram.