Quiz ahoy! How deeply do you know our oceans?

By Nikki Galovic

30 November 2017

1 minute read

The wind in your hair, the sand on your face and the seagull in your chips. It all reminds you of the beach. But there’s so much more to our oceans than the very edges we see when we rush to the shores in the summer months.

Australia has the third largest marine estate in the world, extending from the coast to the abyssal ocean, from the tropics to Antarctica. And the ocean affects nearly all components of our lives.

Oceans provide us with food, with opportunities to work and play, and help control the environment in which we live. Oceans ultimately provide the water we drink and the air we breathe. So how much do you know about our life-giving oceans? Put your knowledge to the test.

#1 As much as 80% of the oxygen we breathe comes from plants in the ocean

It is estimated that 50–80% of the oxygen in the atmosphere is produced by marine plants. During photosynthesis, plants remove carbon dioxide from sea water and release oxygen.

#2 The Great Barrier Reef is the world’s largest reef system

Made up of over 3000 individual reefs and shoals and extending over 2600 km from the south coast of Papua New Guinea to just north of Fraser Island, our very own Great Barrier Reef is certainly the world’s largest reef system. It supports over 1500 species of fish, 30 marine mammal species, six species of sea turtle, 215 visiting or nesting species of birds, and 17 sea snake species. Plus over 4000 species of invertebrates, including corals, sea cucumbers, sea stars, crabs, shrimps, molluscs and worms also are known from the Great Barrier Reef with many more undescribed.

#3 Plants can live at 1000 metres depth in the ocean

No plants live at these depths because there is no light. Some animals do though. They live in total darkness, at extreme pressure, with relatively low oxygen levels, and at temperatures of less than 4 degrees. 

#4 The Mariana Trench is thought to be the deepest part of the world’s ocean, but it’s not as deep as Mount Everest is tall.

If Mount Everest was dropped into the trench at the deepest point of the Mariana Trench, its peak would still be 1.6 km underwater.

#5 For every species of marine life in Australia we know of, at least another seven are yet to be discovered

Some 33,000 marine species, mainly animals, are recorded from Australian waters.  About 17,000 others have been collected but not catalogued. It is estimated that only 10-20% of Australian marine organisms may have been sampled so there may be as many as 250,000–500,000 Australian marine species. 

#6 What is the name of the point on Earth, located in the Pacific ocean, that is most farthest from land?

The part of the ocean farthest from land lies in the South Pacific and is known as Point Nemo or ‘The Pole of Inaccessibility’. Point Nemo isn’t an actual ‘point’ as (obviously) there’s no land there — it’s simply a spot in the ocean that happens to be 2,688 kilometres from the nearest land. The name doesn’t come from the film Finding Nemo. It actually comes from Jules Verne’s Captain Nemo of Twenty Thousand Leagues under the Sea.



You did it! You are a master of Ocean trivia (as a reward go and download our book for free).

Oh geez! We know you tried your best! To make you feel better why not go and download a free copy of our Oceans book?


Salty you didn’t get a better score?