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Is the underlying rock beneath the ocean floor silica?
The underlying rock beneath the ocean floor is primarily basalt, which is a mafic rock rich in iron and magnesium. Silica-rich rocks like granite are typically found in continental crust, not beneath the ocean floor.
What rock type is most abundant in the crust of the ocean floors?
The most abundant rock type in the ocean floor crust is basalt. This volcanic rock forms from the rapid cooling of lava at mid-ocean ridges and is a key component of oceanic crust. Basalt is typically dense and rich in iron and magnesium, distinguishing it from the continental crust, which is primarily composed of lighter granitic rocks.
What evidence do geologists have that volcanoes occur on the ocean floor?
Plenty. The biggest is that core samples show iron particles in the floor of the Atlantic to be polarized in north-south "strips". As you move away from the mid-Atlantic ridge in either direction, you get a strip polarized north-south, and then another where strip polarized the opposite way, south-north, and so on ... and these strips match up perfectly for age and orientation on either side of the mid-Atlantic ridge. This discovery led Tuzo Wilson directly to his theory of continental drift. The only thing that could explain this pattern, he said, was if the floor of the Atlantic was growing and spreading over time, and that these polarization patterns were reflecting the polarization of the earth's magnetic field (which flips periodically) at the time that section of floor was formed. A second piece of evidence, perhaps more compelling for laymen, was his subsequent prediction that an entire chain of successively smaller, submerged volcanic islands would be discovered northwest of the Hawaiian island chain. This is because, he hypothesized, the Pacific plate is drifting northwest over a "hot spot" in the underlying magma that burns its way through, creating volcanoes which create islands. Over time, the plate continues to drift and the volcano goes dormant. The island erodes away, but by then a new island is forming, similar to the effect you might get by passing a sheet of paper slowly over a candle.
Who is the person who makes table doors out of iron?
the person who makes tables, doors and objects out of iron
Where are magnetic bands formed to ocean ridges?
It's formed in magma before it is oozed up through the ocean floor at the Mid-Atlantic Ridge. While it is still liquid, the iron molecules in the lava can orient themselves along the magnetic lines of force that envelope the earth.
What was the composition of the early ocean?
The primitive ocean was composed of dissolved iron. This could have given it a reddish colour. The iron existed from volcanic activity. After the evolution of photosynthesis, the iron precipitated out and oxygen has composed the qualities it has today.
Is the underlying rock beneath the ocean floor silica?
The underlying rock beneath the ocean floor is primarily basalt, which is a mafic rock rich in iron and magnesium. Silica-rich rocks like granite are typically found in continental crust, not beneath the ocean floor.
How would this history of reversals show itself of the ocean floor?
it tugs on the iron pieces in the sand causing ripples.
How would this history reversals show itself on the ocean floor?
it tugs on the iron pieces in the sand causing ripples.
What rock type is most abundant in the crust of the ocean floors?
The most abundant rock type in the ocean floor crust is basalt. This volcanic rock forms from the rapid cooling of lava at mid-ocean ridges and is a key component of oceanic crust. Basalt is typically dense and rich in iron and magnesium, distinguishing it from the continental crust, which is primarily composed of lighter granitic rocks.
What is the most abundant mineral in the ocean floor?
The most abundant mineral in the ocean floor is likely to be olivine, which is a common mineral found in basaltic rocks that make up the oceanic crust. Olivine is a magnesium-iron silicate mineral that is formed from the cooling and solidification of magma at mid-ocean ridges.
When molten material hardens into rock on the ocean floor the domains of the iron it contains?
line up in the direction of Earth's magnetic field
What is oceanic crust composed primarily of?
basalt
What happen to the Titanic after it sank?
It remained on the ocean floor for 70 years where it slowly decayed and has been eaten away by bacteria which eat iron. In the mid 80's Robert Ballard rediscovered it and occasional expeditions go down to the wreck to study it.
Why were earths oceans originally green?
Because the Earth's first atmosphere/ocean system didn't have free oxygen, dissolved iron accumulated in the oceans, giving them a green color. As oxygen became available, it combined with the iron and settled to the sea floor to form banded iron formations (BIFs). Once the iron was "rusted" out of the water column, the ocean color changed from green to blue.
List three types of evidence for sea-floor spreading?
Magnetic stripes on the ocean floor recorded by magnetometers demonstrate alternating patterns of normal and reversed magnetic polarity, supporting the concept of seafloor spreading. The presence of mid-ocean ridges, where new oceanic crust is formed through volcanic activity, provides direct evidence for seafloor spreading. Analysis of rock samples collected from the ocean floor that show progressively younger ages of rocks as distance from the mid-ocean ridge increases supports the theory of seafloor spreading.
Why are nodules not mined for ores such as maganese and iron?
Nodules containing manganese and iron are found deep on the ocean floor, which makes mining them technically challenging and expensive. There are also concerns about the environmental impacts of deep-sea mining on fragile ecosystems and biodiversity. As a result, mining companies typically focus on more accessible and economically viable sources of these ores on land.
