Sea-floor spreading is the process in which the ocean floor is extended when two plates move apart. As the plates move apart, the rocks break and form a crack between the plates. Earthquakes occur along the plate boundary. Magma rises through the cracks and seeps out onto the ocean floor like a long, thin, undersea volcano.
(Fig 1.11) Sea floor Spreading.
As magma meets the water, it cools and solidifies, adding to the edges of the sideways-moving plates. As magma piles up along the crack, a long chain of mountains forms gradually on the ocean floor. This chain is called an oceanic ridge. The boundaries where the plates move apart are 'constructive' because new crust is being formed and added to the ocean floor. The ocean floor gradually extends and thus the size of these plates increases. As these plates get bigger, others become smaller as they melt back into the Earth in the process called subduction.
The new rock at the edge has no sediments like the sand or mud, since it is formed only recently. Farther away from the ridge, sand and mud gradually settle on it, in an ever-thickening blanket. The oldest rocks may have 14,000 feet of sand and other sediments resting on top of it.
An example of an oceanic ridge is the Mid-Atlantic Ridge. It is one part of a system of mid-oceanic ridgesthat stretches for 50,000 miles through the world's oceans. The underwater mountains of the ridge may not be more than two miles higher than the surrounding sea floor.
On the whole, sea-floor spreading is basically volcanic, but it is a slow and regular process, without the explosive outbursts of the volcanoes on land.
I assume you mean the igneous/metamorphic basement rocks along the east coast, which are older than the rocks along the mid Atlantic ridge. This is becuase the rocks along the coast were formed from the same process that is producing the new rocks along the mid Atlantic ridge now, but were formed longer ago when the ridge was just forming.
i do not know the answer to my question thank you
the marine west coast and the mediterranean.
The rocks off of the east coast of North America are much older than those right along the mid-Atlantic ridge because sea-floor spreading is occurring where oceanic plates are diverging from one another. The rocks right along the ridge are the newest ones being formed, and the ones off the east coast of North America were formed a long time ago.
Most hurricanes make landfall in the Western Hemisphere, primarily along the coastal regions of the United States, Mexico, Central America, and the Caribbean. The Atlantic coast of the United States, particularly Florida and the Gulf Coast states, is particularly vulnerable to hurricanes. The western coast of Mexico and the eastern coast of Central America also frequently experience landfalling hurricanes.
Most of the trenches are located along the margin of the pacific ocean. Ex. the west coast of South America
Giovanni da Verrazano sailed the Atlantic coast of North America in 1524. He was the first European to explore the Atlantic coast of North America since the Norse.
They are both on the Atlantic Ocean. South America's East Coast and Africa's West Coast are on the Atlantic.
Johann Cromberger in 1538 in Mexico and Hendrick Christiansen in 1613 along the Atlantic Coast of America.
North America
The Gulf Stream
Great Britain, France, Spain, Portugal, Denmark, Sweden,the Netherlands, and the current countries placed along the Atlantic Coast today all claimed areas along the Atlantic Coast.
The British colonies in North America were located along the northern Atlantic coast, including what is now the east coast of the US.
it's flat
The Namib Desert is found along the coast of Namibia.
its located in the west coast of the Atlantic ocean
I think the atlantic city
No. The Atlantic Ocean is on the western coast and Indian Ocean is along the eastern coast.