Тема 12. Моря и океаны

The Pacific is the largest and deepest ocean, and Challenger Deep lies in its Mariana Trench. Tuna, salmon, lanternfish, sharks, and whales live across its many climate zones. It is so large that its waves could ask for their own time zone.

The Atlantic is crossed by the Mid-Atlantic Ridge, an underwater mountain chain. Cod, herring, tuna, swordfish, dolphins, and whales live here. Titanic sank in the North Atlantic in 1912; the ocean keeps history, although it never returns library books.

The Indian Ocean is the warmest major ocean and strongly influences monsoon rains. Tuna, reef fish, dugongs, whale sharks, and coelacanths occur in its region. Its monsoon changes direction, as if the wind checks a seasonal timetable.

The Arctic is the smallest and shallowest ocean, with sea ice that grows and shrinks seasonally. Polar cod, Greenland sharks, narwhals, seals, and bowhead whales live there. A Greenland shark may live for centuries and clearly never rushes to an appointment.

The Mediterranean is almost enclosed by land and connects to the Atlantic through Gibraltar. Bluefin tuna, swordfish, groupers, dolphins, and seagrass meadows occur here. Ancient sailors crossed it for trade; the sea has hosted more meetings than a very busy café.

Deep Black Sea water contains very little oxygen, so most animals live in upper layers. Anchovy, sprat, turbot, dolphins, and mussels are characteristic species. Its name sounds serious, but sunny beaches refuse to follow the dress code.

The Red Sea is warm and salty, with reefs adapted to high temperatures. Parrotfish, butterflyfish, moray eels, rays, and reef sharks live there. It is blue in most photographs, so its name may be the sea’s oldest colour puzzle.

The Caribbean contains coral reefs, deep trenches, and many islands. Parrotfish, flying fish, groupers, turtles, sharks, and dolphins live there, while hurricanes shape coastal life. Flying fish leave the water briefly but still refuse to pay airport tax.

Dolphins are mammals that breathe air and use echolocation to investigate their surroundings. Bottlenose dolphins develop distinctive signature whistles, and one half of the brain can rest while the other stays alert. A dolphin never forgets to surface, but may forget that humans cannot jump as neatly.

Sharks have cartilage instead of bone and most have no swim bladder. Buoyant oily livers and constant movement help many species control depth. Rows of replacement teeth move forward throughout life; a shark’s dentist would need a very large appointment book.

The blue whale is the largest known animal and feeds mainly on tiny krill filtered through baleen. It communicates with powerful low-frequency calls that travel far underwater. The world’s biggest animal orders one of the smallest meals, only in enormous portions.

Humpbacks eat krill and schooling fish and may cooperate using bubble nets. Males produce long changing songs, and populations have different song patterns. Their concerts have no tickets, but the front row is extremely wet.

Orcas are the largest dolphins, not whales in the strict family sense. Different groups have learned diets, hunting methods, and call dialects passed through families. An orca pod has family traditions and probably the loudest dinner discussion in the sea.

The whale shark is the largest fish, yet it filter-feeds on plankton and small animals. Its spot pattern is individually distinctive and helps researchers identify it. It has a giant mouth but chooses snacks smaller than a sandwich.

Mantas are filter-feeding rays that guide plankton into the mouth with head fins. They visit cleaning stations where small fish remove parasites and show complex learning. A manta arrives at the cleaner without making an appointment.

Sea turtles navigate long migrations using cues including Earth’s magnetic field. Different species eat seagrass, sponges, jellyfish, or other animals, and females return to beaches to nest. Their route is thousands of kilometres, yet they never ask a phone for directions.

An octopus has three hearts, blue blood, and many neurons in its arms. It changes colour and skin texture for camouflage and communication and can solve puzzles. With eight arms, it still cannot decide which one should hold the shopping list.

Seahorses are bony fish that swim upright and grip plants with their tails. The male carries developing young in a brood pouch and gives birth. He is a fish with a horse’s name and the sea’s most surprising parental leave.

Penguins are flightless seabirds of the Southern Hemisphere and excellent underwater hunters. Emperor penguins can dive hundreds of metres for fish and squid while adults cooperate through severe winter. Their formal black-and-white clothes are ready for dinner, even when dinner swims away.

Many deep-sea anglerfish use a glowing lure whose light is produced with the help of bacteria. It attracts prey in darkness where sunlight never reaches. The anglerfish brings its own lamp because the deep ocean forgot to install streetlights.