The massive mid-ocean ridge system is
a continuous range of underwater volcanoes
What are some examples of mid-ocean ridges?
Mid-ocean ridges are typically half a mile to six miles wide and over a mile underwater. Two of the most well-known mid-ocean ridges are
the Mid-Atlantic Ridge and the East Pacific Rise
. As you might guess, most of the Mid-Atlantic Ridge is in the Atlantic, and most of the East Pacific Rise is in the Pacific.
What are mid-ocean ridges made of?
The material that erupts at spreading centers along the mid-ocean ridge is primarily
basalt
, the most common rock on Earth. Because this spreading occurs on a sphere, the rate separation along the mid-ocean ridge varies around the globe.
What is the role of the mid-ocean ridge in seafloor spreading process?
Mid-ocean ridges and seafloor spreading can also
influence sea levels
. As oceanic crust moves away from the shallow mid-ocean ridges, it cools and sinks as it becomes more dense. … Seafloor spreading proves that the ocean itself is a site of tectonic activity.
Which is characteristic of mid oceanic ridges quizlet?
Mid-ocean ridges are spreading centers, they are
divergent plate boundaries where magma wells up from below, creating new oceanic crust
. Ocean trenches form where crustal plates plunge back into the mantle. Thus, these long, narrow depressions are associated with convergent plate boundaries.
At what types of boundary do mid-ocean ridges occur quizlet?
Mid-Ocean ridges occur at
divergent plate boundaries
.
Where does mid-ocean ridges occur?
Mid-ocean ridges occur
along divergent plate boundaries
, where new ocean floor is created as the Earth's tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.
What are the 3 types of mid-ocean ridges?
- Axial Ridge.
- Magnetics & Polarity.
- Fast/Slow Spreading.
What are the five example of ocean ridges?
This ridge system includes the
Mid-Atlantic Ridge, Mid-Indian Ocean Ridge, Carlsberg Ridge, Pacific-Antarctic Ridge
, and the East Pacific Rise with its related features, including the Chile Rise, Galapagos Rift Zone, Gorda Rise, and Juan de Fuca Ridge.
Where are ocean ridges generally located?
Ocean ridges generally are located
on the ocean floor at the boundary between two tectonic plates moving apart from each
other, known as a divergent…
Are there volcanoes at mid ocean ridges?
Mid-ocean ridges. The global mid-ocean ridge system is the largest single volcanic feature on the Earth, encircling it like the seams of a baseball. … The mid-ocean ridge consists
of thousands of individual volcanoes or volcanic ridge segments
which periodically erupt.
Why are mid ocean ridges important?
Mid-ocean ridges are geologically important
because they occur along the kind of plate boundary where new ocean floor is created as the plates spread apart
. Thus the mid-ocean ridge is also known as a “spreading center” or a “divergent plate boundary.” The plates spread apart at rates of 1 cm to 20 cm per year.
What is the general age of crust at mid ocean ridges?
Volcanism. Most crust in the ocean basins is
less than 200 million years old
, which is much younger than the 4.54 billion year age of the Earth.
What are two pieces of evidence for seafloor 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 is the role of the mid-ocean ridge in 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 . …
How is magma formed at mid ocean ridges?
Abstract. Mid-ocean ridges are considered the planet's largest magmatic system. At divergent plate boundaries, magma is
generated by decompression melting of upwelling mantle
. Melts are focused as they ascend through the upper mantle and lower crust and collect beneath the ridge axis in elongate melt lenses.
