Questions tagged [ocean-ridge]
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16 questions
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If among oceanic crusts older means heavier, then why is old continental crust lighter than new oceanic crusts?
When we consider two oceanic crusts, the older oceanic crust is heavier and the newer oceanic crust is lighter.
But when we consider two crusts, one continental and the other oceanic, continental ...
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What are the parallel horizontal lines on Google's satellite images? [duplicate]
On Google Earth I noticed many straight lines. While looking for answers for their existence, I came across this Quora answer, which provided a good response for why there are converging lines to ...
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Why does the ocean floor look so scratchy?
Why does some part of the ocean floor look so scratchy?
If you look at Google Earth image of the Indian ocean floor, especially the area south-west of Sumatra, it looks like some cosmic beast ...
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What causes the "ripples" that extend east-west along the mid-atlantic ridge?
Below are two cropped screenshots from the super-cool video Draining Earth's oceans, revealing the two-thirds of Earth's surface we don't get to see with the oceans "drained" to 4000 and 5000 meters ...
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How can linear oceanic ridges (like the East Pacific Rise) be explained by single point mantle plumes?
I'm a bit confused about how divergent boundaries between tectonic plates work, or just why plates move. I've read that these ridges that are in the place of divergent boundaries are created when ...
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Are there seamounts as close as 100 m to the water surface and not inside any Exclusive Economic Zone?
I did not find any seamounts as close as 100 m to the water surface (100m from the mean surface level at the location of the mountain) that are not part of any Exclusive Economic Zone (EEZ.)
Do any ...
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Why is the Lithosphere-Asthenosphere Boundary an Isotherm?
My understanding of the LAB is that it represents the point in the earth where the mantle undergoes a temperature activated mechanical change. The temperature of the boundary depends on the melting ...
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What is meant by intraplate volcanism?
I am having massive confusion on whether intraplate volcanism refers to volcanism occurring at plate boundaries or away from plate boundaries (such as formation of ocean island basalts), or perhaps ...
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Is the Mid-Atlantic Ridge a ridge or a trench?
I am confused after reading conflicting text from different sources. For example, I read that divergent oceanic plates form ridges. National Geographic calls Mid-Atlantic Ridge a valley!
On the other ...
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Divergent boundary and trenches between oceanic plates
Why Divergent boundary create ridges between oceanic plates and rift valley between continental plates? I think that the ridges are formed because of the volcanic eruptions. But like rift valley in ...
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Why did it take so long to discover the volcanic nature of mid-oceanic ridges?
I just read this article and was astonished to see the following:
Oceanographers stumbled on [the mid-oceanic ridges'] volcanic nature in 1973.
What I find surprising is how recent that is.
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Plate Tectonics: Is it possible to have an ocean-continent divergent boundary
I am procedurally generating planets for an open world space sandbox game. I am using a rough simulation of tectonic plates to create mountain ranges and other geological features.
A planet surface ...
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Are Helium 3 and 4 being produced by earth's core?
J. Marvin Herndon claims that the evidence of the georeactor comes from 3He/4He ratios released to the oceans at the mid oceanic ridges. Georeactor-produced 3He/4He ratios are related to the extent of ...
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Why is there a bend in the Lomonosov Ridge?
Why is there a bend in the Lomonosov Ridge?
This is a supplementary question to that asked by Sabre Tooth in What is the tectonic explanation for parallel ridges in the Arctic ocean
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What is the tectonic explanation for parallel ridges in the Arctic Ocean?
Looking at a map of the underwater features of the Arctic Ocean reveals three roughly parallel ridges, separated by basins (see image below):
Image source
The three ridges, as labelled are the Alpha ...
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