Oceans quiz
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Which body other than the Moon also raises Earth's tides?
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More questions about Oceans
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Why is it easier to float in the sea than in a pool?
Answer: Denser water
Why: Each liter of seawater carries about 35 grams of dissolved salt, which makes it heavier than fresh water and lets you float higher.
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Why does deep, clear seawater look blue?
Answer: Red light absorption
Why: Where floating sediment and particles are plentiful, light bouncing off them can turn the sea green, red or other colors instead.
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About how long is the mid-ocean ridge system?
Answer: About 65,000 km
Why: At that length the ridge is about nine times as long as the Andes, the longest mountain range on land.
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Which toys lost at sea in 1992 helped track ocean currents?
Answer: Rubber ducks
Why: Ten months after the spill, beachcombers began finding the toys in Alaska, about 3,200 km from where they went overboard.
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Where does the world's largest ocean current flow?
Answer: Around Antarctica
Why: It moves well over 100 million cubic meters of water a second, more than 100 times the flow of all the world's rivers combined.
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What ocean layer lets sound travel thousands of km?
Answer: SOFAR channel
Why: Colder water slows sound above it and rising pressure speeds it up below, so sound keeps bending back into the slow layer near 1,000 m.
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