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Questions tagged [geobiology]

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2
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1answer
47 views

Why are there places where trees don't grow?

I can understand places like a desert where it's too dry or tundra where it's too cold, but why are there places like meadows or fields in the middle of the forest where trees don't grow? Or even ...
7
votes
1answer
56 views

How can half a degree of average temperature result in such devastating impact on coral reefs?

Yesterday I read a number of news stories about the new IPCC's (International Panel on Climate Change) report regarding the current state of global warming. It reported that we are on track for ...
1
vote
1answer
70 views

Does crustal thickness have anything to do with how life existed and sustained on Earth? [closed]

The original question that was put on hold "If the crust were the thickest layer of Earth, what effect would its thickness have on organisms?" was actually one of those 'counterfactual question' ...
2
votes
1answer
59 views

How quickly can coral fossilize?

On a trip to Honduras a few years ago I visited one of the islands off its north coast with a friend and went to a section of it mostly with nothing but residences which looked far less visited by ...
9
votes
1answer
167 views

Is it true that “All life on earth gets its energy from the sun”? How much biomass is not derived from photosynthesis?

In helping my son with his college biology I ran across some statements that I think are wrong according to updated data. The copyright is 2017 so it is supposed to reflect the most current knowledge....
2
votes
1answer
35 views

Saharian calima dust, apart of Fe2O3 does contain FeO?

It is repeated often that Saharan calimas are fertilizing often Atlantic ocean. But I suppose that most of Saharan dust contains Fe2O3 and not FeO. Am I right?
-1
votes
2answers
82 views

Can the sealed bottle garden be called a perpetual motion machine? [closed]

I was not sure just where to ask this question, but I was wondering if the sealed bottle garden be really called a perpetual motion machine. http://www.dailymail.co.uk/sciencetech/article-2267504/The-...
3
votes
2answers
165 views

What makes pollen varieties useful index fossils?

What makes pollen varieties useful index fossils? Should pollen not be a poor index fossil?
5
votes
1answer
122 views

Why haven't weeds overtaken the entire planet?

Given how rapidly weed plants spread and grow, choking out all other plant life, how come after millions of years we haven't ended with forests full of thistle or pokeweed, as opposed to pines or oak ...
3
votes
1answer
304 views

The free oxygen (O$_2$) in the atmosphere is largely a result of what process?

Does it come from a)atmospheric lightning and ozone dissociation. b)meteorite impacts early in the earth's geological history. c)Paleozoic volcanic activity. d)photosynthetic processes. e)...
14
votes
2answers
3k views

Why One Side of Mountain Range is Lush

I'm new to this site and certainly not someone with any real background in atmospheric science, so please forgive me if this question is a little stupid. I recall learning in High School about ...
12
votes
1answer
107 views

Average Aragonite:Calcite ratio in biogenic CaCO3 in the oceans

I wonder what the average ratio between aragonite and calcite is during the precipitation of biogenic calcium carbonate in seawater. I know some species are aragonite-favouring and some perfer using ...
10
votes
1answer
177 views

How can the 'abiogenic oil' hypothesis be disproven?

We do know that complex hydrocarbons (e.g., tholins) exist in the outer Solar System. Some geologists maintain that at least some oil on Earth is of non-biological origin. The mainstream, though, ...
22
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2answers
1k views

Peak phosphorus - what are the sinks?

The minable phosphorus reserves are limited. Where is the mined phosphoprus landing, what are the global phosphorus sinks? I would assume that most phosphorus is used for fertilizer and ultimately ...
20
votes
2answers
751 views

How are the banded-iron-formation iron-ores formed?

Many of the richest and purest iron ores are found in so called banded iron formations, cm thick magnetite or hematite layers intermixed with iron poor rock layers. Since these are usually of pre-...
12
votes
2answers
219 views

What are the ramifications to life on Earth when the Earth's magnetic poles switch?

This question is related to this question about the cause of the Earth's magnetic field switching polarity. My question is: How does this switch in the polarity of the magnetic field affect life on ...