The correct order of seafloor features from the coast to the mid-ocean ridge is:
shelf, slope, rise, abyssal plain.
Is the seafloor the oldest at the mid ocean ridges?
The oldest seafloor is comparatively very young,
approximately 280 million years old
. … 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.
What are the steps in the formation of a mid-ocean ridge?
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when
convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary
.
How does the new seafloor form at the mid-ocean ridge quizlet?
How does new seafloor form at mid-ocean ridges?
As the seafloor spread apart at magma is forced upward and flows from new seafloor
. As new seafloor moves away from the mid-ocean ridges, it cools, contracts, and becomes denser. This denser, colder seafloor sinks, helping to form the ridges.
How does the ocean floor move at the mid-ocean ridge?
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 is an example of mid-ocean ridge?
Mid-ocean ridges form where two tectonic plates are pulling apart, also called seafloor spreading. … The
Mid-Atlantic Ridge
, which is spreading one to two inches a year, along with the East Pacific Rise, which is spreading two to six inches a year, are two examples of very long mid-ocean ridges.
What do you expect to find at a mid-ocean ridge what is the answer?
The massive mid-ocean ridge system is
a continuous range of underwater volcanoes that wraps around the globe like seams on a baseball
, stretching nearly 65,000 kilometers (40,390 miles). … As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.
What is the oldest rock 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 rocks next to the mid-ocean ridge younger than those farther away from the ridges?
How did scientists discover that rocks farther away from the mid-ocean ridge were older that those near the ridge? Oceanic crust near the mid-ocean ridge is younger than the crust farther from the ridge. … The process by which
oceanic crust sinks beneath a deep-ocean trench and back into the mantle
.
What is the oldest crust on Earth?
Earth’s oldest known piece of continental crust dates to the era of the moon’s formation.
Australia
holds the oldest continental crust on Earth, researchers have confirmed, hills some 4.4 billion years old.
What does the presence of new rock near an ocean ridge indicate?
There is always a deep-sea trench underneath.
There is evidence of seafloor spreading
. They are made from oceanic crust.
What are 2 pieces of evidence that support seafloor spreading?
Look at Figure 19 to see the process of sea-floor spreading. Several types of evidence from the oceans supported Hess’s theory of sea-floor spreading-
evidence from molten material, magnetic stripes, and drilling samples
. This evidence also led sci- entists to look again at Wegener’s theory of continental drift.
What happens when two plates carrying continental crust collide?
Plates Collide When two plates carrying continents collide, the continental crust buckles and rocks pile up,
creating towering mountain ranges
. The Himalayas were born when the Indian subcontinent smashed into Asia 45 million years ago.
Which mid-ocean ridge is spreading the slowest?
The Ridge
is named after him, and the name was recognized in April 1987 by SCUFN (under that body’s old name, the Sub-Committee on Geographical Names and Nomenclature of Ocean Bottom Features). The ridge is the slowest known spreading ridge on earth, with a rate of less than one centimeter per year.
Where is the mid-ocean ridge located?
Mid-Atlantic Ridge, submarine ridge lying
along the north-south axis of the Atlantic Ocean
; it occupies the central part of the basin between a series of flat abyssal plains that continue to the margins of the continental coasts.
What is the role of the mid-ocean ridge in the movement of lithospheric plates?
The mid-ocean ridge represents an area where, in accordance with plate tectonic theory, lithospheric plates (also called tectonic plates)
move apart and new crust is created by magma (molten rock) pushing up from the mantle
. …
