
Seas & oceans
What Is Sea Foam? How Waves Make Coastal Foam
A beach covered in froth can look as though someone has poured detergent into the surf. Sometimes foam does involve pollution, but the appearance…
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Explore oceans, seas and the geography of connected waters.

Seas & oceans
A beach covered in froth can look as though someone has poured detergent into the surf. Sometimes foam does involve pollution, but the appearance…
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Seas & oceans
A white whale breaking the surface gives only a brief glimpse of a beluga’s life. Underwater, sound reveals another part of the story: animals…
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Seas & oceans
A manatee can graze underwater like a cow in a meadow, but the resemblance is a feeding habit, not a family relationship. Understanding its…
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Hudson Bay · Coasts
On a map of Canada, Hudson Bay looks almost like a hole in the continent. Yet its ocean connections, far-reaching river network and winter…
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Seas & oceans
“The deep sea” can mean dark water far below a ship, the seabed beneath it, or both. A useful depth diagram keeps those meanings…
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Seas & oceans
Polar oceans freeze into an evolving mixture of crystals, slushy patches, pancakes, and older floes. Heat loss, water movement, and the fate of salt…
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Salton Sea · Seas & oceans
A lake in the California desert can have a history shaped by both river floods and irrigation. The Salton Sea is a useful example:…
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Greece · Seas & oceans
The Ionian Sea is easy to recognize between Italy and Greece, but less easy to outline precisely. Its northern boundary, the islands associated with…
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Coasts
A Caribbean map can show a sea, an island region or a collection of countries and territories. Those are not identical outlines. Separating the…
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Seas & oceans
The Baltic Sea stretches into several long gulfs, so a familiar name on one shore may be far from another Baltic destination. Its map…
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Islands
The Aegean is crowded with familiar island names, but knowing an island’s name is not always enough to place it. A few island groups,…
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Coasts
The Adriatic’s two shores can look surprisingly different on a map: a long Italian coastline faces an eastern shore broken by islands and channels.…
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