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Flat Earth Theory / Re: some doubts about the globe

« on: June 07, 2016, 01:29:49 PM »

First of all, remember that 5000 - 6000 C is just a guess based on all relevant data. Nobody is claiming to know with absolute certainty what the temperature of the earth's core is. The study referenced by wikipedia for its 5400 C figure is from 2002. It's a safe bet that that study took into account anything learned from the Kola borehole.

Quote from: wavecrusher on June 05, 2016, 05:35:21 AM
Yep,its not likely to be linear.The temperature is likely to always be increasing,the rate of change of temperature should increase until a  maxima is reached.

I agree that temperature will likely always increase. But why do you think the rate of change of temperature will always increase? Just because it skyrockets in a particular layer, doesn't mean it will continue to accelerate at that rate.

Remember that the borehole only reaches 12 km deep. The radius of the earth is 6300 km. They haven't even broken through the crust yet. The crust can be thought of as a boundary layer. Weird stuff happens in boundary layers. Temperature trends in boundary layers are almost never representative of the system as a whole. This page on the geothermal gradient might be interesting to you:

The temperature gradient dramatically decreases with depth for two reasons. First, radioactive heat production is concentrated within the crust of the Earth, and particularly within the upper part of the crust, as concentrations of uranium, thorium, and potassium are highest there: these three elements are the main producers of radioactive heat within the Earth. Second, the mechanism of thermal transport changes from conduction, as within the rigid tectonic plates, to convection, in the portion of Earth's mantle that convects. Despite its solidity, most of the Earth's mantle behaves over long time-scales as a fluid, and heat is transported by advection, or material transport. Thus, the geothermal gradient within the bulk of Earth's mantle is of the order of 0.5 kelvin per kilometer, and is determined by the adiabatic gradient associated with mantle material (peridotite in the upper mantle).

yep...thats pretty interesting,radioactive heat production....ok,that doubt is cleared for now i guess.




I cant quite visualize that...so down is relative to every person who is standing on the earth? So...in a simulated condition(lets say in space),u were standing on a metal ball, on the underside,so u see everybody else upside down,and there was an pull of 9.81 ms^-2 generated by the ball on you,you would be able to feel that you were the right side up instead of upside down?

Does it work on anything other than a globe?If you stand on the underside of electromagnetic metal bar,upside down  ,with metal boots,and there is 19.62 ms^-2 acceleration acting toward the metal bar,and he walked on the bar.Would he feel as if he was walking normally after a while?

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Flat Earth Theory / Re: some doubts about the globe

« on: June 05, 2016, 05:35:21 AM »

1.Change in Gradient

Counter question: How does your body detect which direction is up?

Intuitively,it depends on the gradient and the way that a person would be standing if we placed him on different parts of the globe compared to his original position-Eg:If a person is standing at a point of the earth which has a completely horizontal tangent to the surface of the earth,and we place him where the land makes a completely vertical tangent to the surface of the earth,he will be feeling as if he is walking on a 90 degree reversal of the previous surface which he was originally standing on.He will only be supported by gravity,and might need a bit of time(walking on a perpendicular hill is never easy )to get adjusted.

2.Core of the Earth

... Ignoring any factors other than the average heat increase for 12.262 km,the expected temperature at the core should be around 14.67*6401 which is approximately 94000 degrees Celsius.

How then,do we get the relatively cold 6000 degrees Celsius as the temperature of the Earth's core.

I don't think a constant gradient is a good assumption. From wikipedia:


The temperature of the inner core can be estimated by considering both the theoretical and the experimentally demonstrated constraints on the melting temperature of impure iron at the pressure which iron is under at the boundary of the inner core (about 330 GPa). These considerations suggest that its temperature is about 5,700 K (5,400 °C; 9,800 °F).

Yep,its not likely to be linear.The temperature is likely to always be increasing,the rate of change of temperature should increase until a  maxima is reached.


Lets look at the practical experiment-The Kola Superdeep Borehole

The Kola borehole penetrated about a third of the way through the Baltic continental crust, estimated to be around 35 kilometers (22 mi) deep.

The hole reached 12,262 m (40,230 ft) in 1989. In that year, the hole depth was expected to reach 13,500 m (44,300 ft) by the end of 1990 and 15,000 m (49,000 ft) by 1993.[5][6] However, because of higher-than-expected temperatures at this depth and location, 180 °C (356 °F) instead of expected 100 °C (212 °F), drilling deeper was deemed unfeasible and the drilling was stopped in 1992.[4] With the projected further increase in temperature with increasing depth, drilling to 15,000 m (49,000 ft) would have meant working at a temperature of 300 °C (570 °F), where the drill bit would no longer work.

Theoretical rate of change of temperature expected between 0-12.26 km deep-8.15 degrees celsius
Rate of change of temperature between 0-12.26 km deep-14.68 degrees celsius-180 degree celsius
Rate of change of temperature projected between 12.26-15km deep-43.8 degrees celsius-300 degree Celsius
Average temperature

Theoretical temperature of the mantle 500-900 degrees Celsius(at 35 km)


Doesn't seem like a maxima is being reached...the gradient just keeps rocketing.I do agree that this doesn't isn't empirical proof against globe earth since the rate of change of the temperature may decrease at some point.It is just something to think about.


Uhh..i messed up the quotes and stuff..sorry,im new to this website

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Flat Earth Theory / some doubts about the globe

« on: June 04, 2016, 05:48:50 PM »

Posted: 2 weeks ago
I was in the Flat Earth bandwagon a while back.I have changed my views a bit and now i consider myself to be an earthal agnostic (i dont want to use global or planar ,if there is a better word please inform me) on the matter.However I have some doubts about the globe which I cannot get my head around.

1.Change in Gradient

If the Earth is a sphere,wont there be constant gradient shifts everywhere? In Australia we would be upside down as compared to the American or Northern European and vice versa.How do people get adjusted to these gradient shifts and why do we not feel any semblance of a slope change when travelling to two countries with almost opposite slopes?(America and New Zealand/Australia).Shouldn't a dude going from the United States to Australia feel like the world is upside down?

2.Core of the Earth

Modern science believes the globe to have a core which is around 6401 km deep or 3977.7 miles.The temperature is believed to be 6000 degrees Celsius.

"Experts" in the Flat Earth Conspiracy know the depth of the Kola Superdeep Borehole.12.262 km,the temperature however,was a whopping 180 degree Celsius.Thats a rise of about 14.67 degrees Celsius per km(never mind at 15km it was expected to be at 300 degrees which is 20 degrees per km).

Ignoring any factors other than the average heat increase for 12.262 km,the expected temperature at the core should be around 14.67*6401 which is approximately 94000 degrees Celsius.

How then,do we get the relatively cold 6000 degrees Celsius as the temperature of the Earth's core.