08/30/19

Why do plants create enough energy for the entire ecosystem?
In my environmental class, we were recently learning about the $10\\%$ law that basically says only $10\\%$ of the energy goes from one trophic level to the next. This got me thinking about *why*... more
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06/11/19

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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06/11/19

which statement best describes the big bang theory?
A.The universe began as a ball of energy and has been collapsing since its formation.B.The universe began as a cloud of dust and gas and has been expanding since its formation.C.The universe began... more
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06/10/19

what substance makes up 75 to 90% of every in the human body?
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06/10/19

How to distinguish an explosion crater from an impact crater?
(How) Is it possible to tell the difference between a man made explosive crater and an impact crater?
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06/10/19

When metamorphic rocks undergo pressure, how are they changed?
When metamorphic rocks undergo pressure they are changed, but how are they changed? Do they become fragments of rocks? Doesn't that mean that the difference between sedimentary rocks and... more
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06/09/19

Can humans eat grass?
Can a human eat grass and digest it? Could it be possible to use it as food just like other plants such as wheat or beans?
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06/08/19

How is the atmospheric composition of objects in the Solar System measured?
How is the atmospheric composition of astronomical objects, for example Triton, a moon of Neptune, determined?
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06/05/19

Why do astronomers never put a scale on their photographs?
Why do astronomers never put a scale on their photographs? I have been looking at images of the Bird nebula, a collision of three galaxies, but in none of the dozen or so that I have found, nor in... more
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06/05/19

How to explain the existence of heavier elements in Population I stars and in Population II stars contain lighter one?
Recently I read Astrophysics Notes where I found a statement that young stars are classified as Population I stars and relatively older one as Population II stars. Population I stars contain... more
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06/01/19

Is there any disease in adult human, other-than cancer, which-is resulted from mutation?
On all environmental articles I read about 3 impacts of mutagens (say Cigarette/ Naphthalene/ EtBr/ Colchicine/ ionizing radiation/ whatever )...**1**. direct effect on tissues, other than... more
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05/31/19

Why and how does complexity usually tend to increase through time?
The question of complexity is classic in the very first lectures of evolutionary biology where the teacher usually tries to tell the students that complexity does not necessarily increase and that... 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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05/22/19

Could hydrogen replace oxygen in cellular respiration?
I was wondering what oxygen actually does in the body. I have seen a few answers to other questions that involve the electron chain and I am really not sure what that is. So I was wondering what... more
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05/21/19

When are population dynamics models useful?
When are population dynamics models useful? There seems to have been a lot of research about it, but how does it help? If I need data about how a population will evolve under what conditions, I... more
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05/21/19

What percentage of fish are herbivorous vs. carnivorous?
It appears that the majority of fish we eat are carnivorous, such as salmon and tuna. This got me wondering how common herbivores and carnivores are among fish species. I couldn't find an answer to... more
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05/18/19

Why Aluminum Steel and Foil are susceptible to corrosion? And why it is important to protect these products from corrosion?
Environmental Impacts of Corrosion PreventionIs there any any negative environmental impact created by the corrosion protection techniques used for these two products?
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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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05/16/19

How do we look inside the cell?
My sister is in 9th grade biology and her teacher avoided answering the question of how we actually study the inside of a cell. I haven't taken biology in a while but I'd like to give her an... more
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05/14/19

Define the term light year
Talking about distance
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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

What is the cause of the jet streams?
Jet streams are fast-flowing currents of air in our earth's atmosphere. An enormous amount of energy is necessary to keep a jet stream going. Where does this come from and why?
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05/14/19

How many stars are in the Milky Way galaxy, and how can we determine this?
I have heard multiple estimates on the quantity of stars within our galaxy, anything from 100 to 400 billion of them. The estimates seem to be increasing for the time being. What are the main... 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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