The South China Sea and East Indies, eastern Mediterranean, Black Sea, North Sea, and British Isles are the most dangerous seas in the world, with the greatest number of shipping accidents in the last 15 years, according to a report released by the World Wildlife Fund (WWF).
The pressure from the water would push in on the person's body, causing any space that's filled with air to collapse. (The air would be compressed.) So, the lungs would collapse. At the same time, the pressure from the water would push water into the mouth, filling the lungs back up again with water instead of air.
The seabed (also known as the seafloor, sea floor, or ocean floor) is the bottom of the ocean, no matter how deep. All floors of the ocean are known as 'seabeds'.
“The intense pressures in the deep ocean make it an extremely difficult environment to explore.” Although you don't notice it, the pressure of the air pushing down on your body at sea level is about 15 pounds per square inch. If you went up into space, above the Earth's atmosphere, the pressure would decrease to zero.
the ocean floor– the bottom of a sea or ocean1. the ocean floor; the ocean bottom; the Davy Jones; the seabed; the sea bottom; the Davy Jones's locker; the sea floor.
More than eighty percent of our ocean is unmapped, unobserved, and unexplored.
Deep diving is defined as a dive that exceeds 60 feet (18.28 metres). That means that most people can dive up to a maximum of 60 feet safely. For most swimmers, a depth of 20 feet (6.09 metres) is the most they will free dive.
Vescovo's trip to the Challenger Deep, at the southern end of the Pacific Ocean's Mariana Trench, back in May, was said to be the deepest manned sea dive ever recorded, at 10,927 meters (35,853 feet).
Ocean trenches are long, narrow depressions on the seafloor. These chasms are the deepest parts of the ocean—and some of the deepest natural spots on Earth. 5 - 12+ Earth Science, Geology, Geography, Physical Geography.
When two oceanic plates converge, the denser plate will end up sinking below the less dense plate, leading to the formation of an oceanic subduction zone. Whenever a subduction zone is formed, the subducted plate will end up being partially melted by the earth's internal magma and molten.
A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth's mantle to the surface, solidifying to create new oceanic crust.
The three most common organisms at the bottom of the Mariana Trench are xenophyophores, amphipods and small sea cucumbers (holothurians), Gallo said. The single-celled xenophyophores resemble giant amoebas, and they eat by surrounding and absorbing their food.
Why are most oceanic trenches found in the Pacific Ocean? The Pacific Ocean is shrinking and plates are descending below surrounding plates along its edges, hence the creation of trenches.
Plate tectonics affects humans in several important ways. What would Earth be like without plate tectonics? We'd have many fewer earthquakes and much less volcanism, fewer mountains, and probably no deep-sea trenches. In other words, the Earth would be a much different place.
Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.
Sea-floor spreading is what happens at the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor. As the plates move apart, new material wells up and cools onto the edge of the plates.
Most volcanoes form at the boundaries of Earth's tectonic plates. Volcanoes are most common in these geologically active boundaries. The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries.
why or why not? They already are merged, you can sail a ship through all the ocean basins without leaving the water. Only the names we gave these basins change, that is for our reference & not for any structural reason.
When two plates diverge, magma from the mantle wells up and cools, forming new crust; when convergence occurs, one plate descends—i.e., is subducted—below the other and crust is resorbed into the mantle.
The crust is made of solid rocks and minerals. Beneath the crust is the mantle, which is also mostly solid rocks and minerals, but punctuated by malleable areas of semi-solid magma. At the center of the Earth is a hot, dense metal core.
The extreme depth of the Mariana Trench and other oceanic trenches is caused by subduction - where on the boundary of two converging tectonic plates, one descends down into Earth's mantle, creating a deep trough.
The Mariana Trench is part of a global network of deep troughs that cut across the ocean floor. They form when two tectonic plates collide. At the collision point, one of the plates dives beneath the other into the Earth's mantle, creating an ocean trench.
Without this water, Earth would not have the diversity of life forms, the continents we live on (it takes water to create most continental rocks), or the atmosphere that protects us. If Earth's surface were entirely smooth, with no mountains or basins, water would cover the entire planet.
The Atlantic Ocean grows 1.5 inches wider every year. That's because the tectonic plates undergirding the Americas are separating from those beneath Europe and Africa.
Deepest oceanic trenches
| Trench | Ocean | Maximum Depth |
|---|
| Mariana Trench | Pacific Ocean | 10,920 m (35,830 ft) |
| Tonga Trench | Pacific Ocean | 10,820 m (35,500 ft) |
| Philippine Trench | Pacific Ocean | 10,540 m (34,580 ft) |
| Kuril–Kamchatka Trench | Pacific Ocean | 10,542 m (34,587 ft) |
Which best describes an ocean trench? A deep, curved depression near the margin of a continent or chain of volcanic islands. Lava erupts from the mid-ocean ridge and is carried away as the floor of the ocean spreads apart.
What are deep-ocean trenches? Long, narrow creases in the seafloor representing the deepest parts of the ocean floor. Most are located along the margins of the Pacific Ocean, with only two being located in the Atlantic.
After all, it was only in 1997 that researchers discovered the Sirena Deep, which is also located in the Mariana Trench, which they measured at 35,210 feet, less than a thousand feet shallower than the Challenger Deep.
Seas are generally much shallower than oceans, just as they are smaller. Regardless, some seas have great depths, such as the Caribbean, which is the deepest in the world at 7,686 meters—a number significantly higher than the average depth of the ocean.
