What is the youngest sea
Baltic SeaThe Baltic Sea in Scandinavia is the world’s youngest sea having formed between 10 thousand and 15 thousand years ago from glacial erosion..
How old is the ocean floor
150 million yearsScientists use the magnetic polarity of the sea floor to determine the age. Very little of the sea floor is older than 150 million years. This is because the oldest sea floor is subducted under other plates and replaces by new surfaces.
What is the cause of seafloor spreading
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.
What are the three types of seafloor spreading
There are three types of plate-plate interactions based upon relative motion: convergent, where plates collide, divergent, where plates separate, and transform motion, where plates simply slide past each other.
Which ocean is most dangerous
Indian OceanFinally, let’s look at one of the biggest and most dangerous seas to sail in the world: the Indian Ocean. To its north lies Asia, to the east Australia, and to the west Africa. In the middle lies an ocean spanning some 20% of the Earth’s watery surface.
Which modern ocean is the youngest ocean
Atlantic OceanThe Atlantic Ocean is the planet’s youngest ocean. It was believed to have been created by the splitting apart of a vast super continent on Earth about 180 million years ago.
Who discovered seafloor spreading
Harry HessHess proposes sea-floor spreading Harry Hess was a geologist and Navy submarine commander during World War II. Part of his mission had been to study the deepest parts of the ocean floor. In 1946 he had discovered that hundreds of flat-topped mountains, perhaps sunken islands, shape the Pacific floor.
Where is the oldest crust on Earth Found
AustraliaAustralia holds the oldest continental crust on Earth, researchers have confirmed, hills some 4.4 billion years old.
What is the deepest ocean
Pacific OceanThe average depth of the ocean is about 12,100 feet . The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam.
Which ocean is the oldest
PacificThe Pacific is the oldest of the existing ocean basins.
Where is the youngest part of the ocean
The youngest crust of the ocean floor can be found near the seafloor spreading centers or mid-ocean ridges. As the plates split apart, magma rises from below the Earth’s surface to fill in the empty void.
Why are the most ancient rocks found on the continents not on the ocean floor
23. Why are the most ancient rocks on earth found only on the continents, whereas only relatively younger rocks are found on the ocean floor? … The continental crust is less dense so the oceanic crust subducts back to the mantle. This process explains why the younger rocks are found on the ocean floor.
What are the 4 steps of seafloor spreading
What are the 4 steps of seafloor spreading?Magma comes out of the rift valley.Magma cools to rock and hardens.Rock is pushed away as new rock is formed at MOR.Oceanic crust and continental crust meet at the trench.Oceanic crust bends down under the continental crust.Gravity pulls rock towards mantle.Rock melts to mantle.Mar 22, 2020
What is the oldest country
By many accounts, the Republic of San Marino, one of the world’s smallest countries, is also the world’s oldest country. The tiny country that is completely landlocked by Italy was founded on September 3rd in the year 301 BCE.
Which is the saltiest sea in the world
the Red SeaInteresting Sea Facts: The saltiest sea in the world is the Red Sea with 41 parts of salt per 1,000 parts of water.
Which ocean is coldest
Arctic OceanThe Arctic Ocean is the smallest, shallowest, and coldest part of the ocean.
Where were the older rocks on the sea floor
The next oldest seafloor is found at the margins of the north Atlantic Ocean and the northwestern Pacific Ocean, as far as possible from the mid-ocean ridges where they were created. These parts of the seafloor are about 200 million years old. Age of the oceanic crust. Courtesy of NOAA.
What causes the ocean floor to deepen with age
During seafloor spreading, lithosphere and mantle cooling, contraction, and isostatic adjustment with age cause seafloor deepening. … In addition, the cooling plate model explains the almost constant depth and heat flow observed in very old seafloor and lithosphere.
What are the oldest rocks found on Earth
In 1999, the oldest known rock on Earth was dated to 4.031 ±0.003 billion years, and is part of the Acasta Gneiss of the Slave craton in northwestern Canada.
Why are continents so much older than the ocean basins
Continental crust is almost always much older than oceanic crust. Because continental crust is rarely destroyed and recycled in the process of subduction, some sections of continental crust are nearly as old as the Earth itself.
What ocean is the hottest
Persian GulfAnswer: The hottest ocean area is in the Persian Gulf, where water temperatures at the surface exceed 90 degrees Fahrenheit in the summer. Another hot area exists in the Red Sea, where a temperature of 132.8 degrees Fahrenheit has been recorded at a depth of about 6,500 feet.