Questions tagged [ocean-ridge]
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15
questions
2
votes
1answer
102 views
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 ...
3
votes
1answer
77 views
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 ...
9
votes
1answer
250 views
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 ...
6
votes
2answers
407 views
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 ...
8
votes
2answers
2k views
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 ...
3
votes
1answer
222 views
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 ...
2
votes
3answers
746 views
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 ...
12
votes
3answers
8k views
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 ...
1
vote
1answer
443 views
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 ...
9
votes
2answers
642 views
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.
...
21
votes
2answers
7k views
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 ...
7
votes
1answer
269 views
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 ...
11
votes
1answer
121 views
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
5
votes
1answer
443 views
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 ...
7
votes
1answer
103 views
What is the geochemical source for the helium detected in deep Arctic explosive eruptions?
Recently, there has been explosive deep-ocean volcanism detected along the slowly-spreading Gakkel Ridge in the Arctic Ocean (see map below), according the National Geographic news article Arctic ...