306 Answered Questions for the topic geology

07/10/19

Volcanoes in the Great Barrier Reef?
Was there ever at any point in time a volcano in the great barrier reef? I thought atolls develop from volcanic islands, and the coral grow around them.
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07/07/19

What controls the acidity of the ocean?
I have learned that: * coral reefs are made up mostly of calcium carbonate * coral reefs are mainly distributed in the tropical zone * The calcium carbonate will be decomposed in the reaction... more
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07/07/19

volcanic effects on the climate during Pangaea?
Which influence does the constellation of the continents have on the global climate? Was the biosphere more susceptible to climatic effects a volcanic eruption may cause during the Permian than it... more
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07/05/19

What structures form due to the melting of subducting plates?
What structures form from the melting of subducting plates? Plutons, Accretionary wedges, Deep sea trenches, Faults?
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07/05/19

What are 'articulate shells'?
I can not really find a definition, not even in a geologic dictionnary: What are articulate (resp. inarticulate) shells? To be more specific, the term is related to tsunami deposits (tsunamite).
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07/04/19

Why do we measure eustatic sea-level from the center of earth?
Earth is rotating so it has a ellipsoidal shape. The measurement will therefore be different from equator and pole. So why do we measure eustatic sea-level from the center of earth?
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07/04/19

What is the motivation behind the choice of unglazed Porcelain as a Streak plate?
What characteristics does Porcelain possess that makes it a good choice for the Streak test? Additionally, are there any other materials that could also be used for designing a Streak plate?
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07/04/19

What is the source of lava of volcano? From magma below crust? Or from molten crust by rubbing?
Ok, it looks like a very simple question but I still have some point want to clarify... Most images explain volcanos contain some orange stuffs as magma below volcanoes as magma chamber, but the... more
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07/03/19

What allowed the Himalaya to become so high?
Of course the mountains were caused by moving tectonic plates. But in case of the Himalaya mountains was the speed of the plates just higher so more energy got 'into' the mountains. Or was the... more
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07/03/19

What is the difference between mineral groups and series?
It seems to me when reading about minerals, groups and series are spoken about interchangably in similar types of contexts. Is there a difference? If so, what?
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07/03/19

Why does mineral oil occur below natural gas?
Why does mineral oil occur below natural gas? It was asked in our science book in the Geology section and I didn't get a clear explanation from the teacher.
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07/03/19

What gravitational evidence do we have to counter the idea that oceans are formed when continents sink?
Is there some evidence for this based on gravity anomalies? I think I know how to tell if a mountain or structure is compensated based on bougeur and free air anomalies, but this really has me... more
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07/03/19

What is the difference between a geologist and a geophysicist?
What are the main differences between geologists and geophysicists?
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07/03/19

Were all of Earth's minerals created before Earth's formation, during, or after?
I've heard that during the accretion of proto-planets that formed the earth, 60 minerals were created through the reactions of atoms and molecules in the nebula. Do these first minerals still make... more
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07/03/19

Uranium Deposits in the Ocean?
I was wondering whether there are any uranium deposits in the ocean floor, or in the rock walls of the continental shelf, etc. I was hoping to have some deep sea uranium deposits accessible from... more
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07/03/19

To what extent has the Earth's surface been geologically mapped?
To what extent has the Earth's surface been geologically mapped? For instance, what fraction has been surveyed at 1:10 000, 1:100 000 or 1:1 000 000 scale? Edit: By 'surface' I mean land surface,... more
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07/03/19

What keeps water from sinking into earth?
I remember reading somewhere that there's evidence of water on Mars but it all sank into the Martian soil. So what prevents that happening on earth? Some people say it's because the crust is not... more
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07/03/19

what is a transverse isotropic rock?
I know isotropic means equal properties in all directions , but the term "transverse" is not making it easy for me to understand.
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06/25/19

Why are alkali basalts found at rifting centres and on top of 'plumes', whereas MORBs are generally tholeiitic?
So I was essentially wondering why it was that the basalts on top of 'plumes' at 'hotspots' (sometimes called OIBs, ocean island basalts) and at continental rifting centres are enriched in alkaline... more
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06/25/19

What was the likely composition of Earth's early crust (how did crustal composition evolve)?
Was the first crust entirely mafic (oceanic) crust which was later distilled via volcanic arcs along subduction zones to make felsic rocks or did the earth start with bits of felsic crust? Are the... more
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06/25/19

What is the age of the earth's oil?
Oil in the ground is found under the oceans and seas. It is made of dead fish. But from what period are those fish? I heard they are about 119 million years old. But fish exist much longer than... more
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06/25/19

What is the difference between subvolcanic rocks and plutonic rocks?
I'm studying Plutonic (Intrusive) rocks and i really dont understand the difference between PLutonic Rocks that form in Sills and Dikes from the so called subvolcanic rocks, also known as a... more
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06/25/19

What would change if our earth lacks mountains?
I just asked myself what is the role of the mountains on our planet earth? Well there's a well known role for the climate and weather. But is there a kind of physical or geological role? What... more
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06/25/19

Why does gold and other metals conglomerate?
When gold, or some other metals, such as copper, are found, they are often found in large nuggets. But, from what I understand, gold is produced in quite stochastic stellar processes. As such,... more
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06/25/19

What is the current status of geophysical global cooling theory?
Plate tectonics effectively rubbished the theory of geophysical global cooling as a means of explaining many surface features on the Earth. However, [this... more
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