306 Answered Questions for the topic geology

06/02/19

Are there minerals which are not been found on earth but which are still possible to exist?
On Earth we find many kind of minerals, a lot of them are silicates. How much different kind of minerals would there be on Earth?But are there Fe minerals found in meteorites which do no occur on... more
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06/01/19

How and where do double-terminated crystals form?
How and where do double-terminated crystals form?Most terminated crystals form by 'growing' out of a rock. Which causes one side to be flat,(or whatever the shape of the rock it 'grew' out of was... more
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Geology Oceanography

06/01/19

Does subduction of plates make them stretch and form the oceans?
Ocean plates subduct beneath continental plates. Does this make the oceanic plates stretch and become thinner so that the elevation of the sea flow is lower? Is this why oceans form where they do -... more
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05/30/19

How much of a mountain is below the surface?
Is there some kind of math rule for how much does a mountain extend (depth) below the surface?I found an article like this... more
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Geology Rocks

05/30/19

How long does it take for a stone to decompose?
We see stones and they appear to be the same throughout our life time. Mountains also appear to not significantly change. So do mountains and stones decompose? What is the life span of a stone?... more
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05/30/19

How is dense magma able to rise and punch through continental crust?
I am trying to understand how a dense basaltic lava is able to rise and punch through the continental crust, such as in mantle plumes or the Great East African Rift. My understanding of plate... more
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05/29/19

What are the differences between alluvial, eluvial and colluvial deposits?
There's always confusion and disagreement when these terms are mentioned. Need to be sure of their exact meanings.
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05/28/19

What do the derivative or the integral of amplitude of a seismogram mean?
I'm doing a project in which I'm analyzing earthquake seismogram waves. I used a program to graph the exact amplitudes and how they changed over the course of a single earthquake. For the project I... more
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05/26/19

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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Geology Gas Petroleum

05/26/19

What's it like inside a natural gas cavern on Earth?
I suppose natural gas underground caverns on Earth have substantial volume and gas is in gaseous form there.As such I wonder how it would look like inside such cavern (with artificial light of... more
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05/25/19

Why do fjords have sills?
I have read about some of the geologic processes that are related to the formation of fjords. Is the presence of sills in fjords related to the deposition of glacial moraine?
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05/24/19

What do continents "lay" on?
It's a simple question.. What do continents "lay" on? Do they float on water? or are they huge bodies that "emerge" from the sea floor/bed? are they connected to the bottom of the oceans? Hope the... more
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Geology

05/23/19

How long does one touch on a stalagmite/stalactite lasts?
There is a discussion about whether touching a stalagmite or a stalactite would stop it from growing or not: https://answers.yahoo.com/question/index?qid=20090629155053AAYFhCM .The results are that... more
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05/22/19

In the oil field, when a vertical cylinder coring sample is taken, how is the core severed at the bottom and removed from the formation?
I would like to know how the core is cut off at the bottom of the drill. I also would like to know how the core is brought up to the surface without slipping out and falling back down.
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05/22/19

Math needed for Hydrology, specifically surface water hydrology?
I wanted to know what math is needed for hydrology, in particular surface water hydrology.In my research online, of Master's programs (either in Hydrology or Environmental Science with a... more
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05/21/19

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 would... more
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05/19/19

Determining a rock age using volcanic ash layer?
I wanted to know if volcanic ash deposits found in the geologic record are most useful in correlating the age of rock layers if the volcanic ash was distributed over a large area during a short... more
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05/18/19

How do seismologists locate the epicenter and focus of an earthquake?
I know the focus of an earthquake is where the earthquake originated from, but what I could never figure out is, how to scientists find out where exactly the focus (and epicenter) are located?
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Geology

05/17/19

How are deposits of metals like tantalum located?
I am curious of how metal deposits are located in general, but to keep my question focused I wanted to just ask about tantalum for example.Are there people who traverse their own country drilling... more
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05/17/19

Newton's estimate of the age of the Earth?
I was reading many articles about estimates of the age of the Earth throughout the ages. I was dumbfounded when I read that Newton, arguably one of the greatest scientists ever to have ‘calculated’... more
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05/17/19

Why do crystals, like quartz and diamonds, form in different colors?
Some crystals, like quartz and diamonds, form in a variety of different colors. For example, quartz can be clear, 'foggy', pink, yellow, and even blue. - What happens during the crystal's formation... more
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05/16/19

Himalayas are currently rising. What will be the highest point they can reach?
Himalayas are currently rising about 5 mm/year. What will be the highest point they can reach?
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05/14/19

Would it be possible to calculate the expected frequency of impact craters of all sizes on Earth?
Can the expected frequency of all sizes of impact craters on Earth be calculated based on the preservation of impact craters seen on the Moon? Taking into account the difference in gravity and... more
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05/14/19

How did the terms "acidic" and "basic" come to be associated with $SiO_2$ in igneous rocks?
Students of geology are introduced to in their petrology course, (or used to be), to the terms "acidic", "basic", and the associated term "intermediate" in relation to... more
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05/14/19

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 the... more
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