Most Popular
1500 questions
8
votes
2 answers
How are 'Morning Glory' clouds maintained?
Reading the Physics.SE question What is the current physical theory of what causes the 'Morning Glory' roll cloud over Northern Australia? (pictured below):
Image source: NASA Astronomy picture of the day 24 August, 2009 of a Morning Glory…
user889
8
votes
1 answer
Is there conclusive evidence to refute an earlier oxygenation of the Earth's atmosphere?
The Great Oxygenation Event (sometimes called the Great Oxidation Event (GOE), as in the journal Nature) occurred around 2.2 to 2.45 billion years ago (Frei et al. 2009). However, in the article A Whiff of Oxygen Before the Great Oxidation Event?…
user889
8
votes
1 answer
Could Earth have had a greater axial tilt?
In thinking about the question, Why is earth's axis tilted?, and reading articles about Earth's axial tilt, I came across the website Snowball Earth which describes an alternate theory for global glaciation proposed by George Williams, from the…
user889
8
votes
1 answer
How global was the Bonarelli Oceanic Anoxic Event?
The Bonarelli Event (a.k.a. OAE2) is a well-studied episode of "worldwide" oceanic anoxic event at the Cenomanian-Turonian boundary (ca. 94 Ma). It is characterized by the presence of organic-rich marine sediments and a $\mathrm{\delta^{13}C}$…
plannapus
- 5,348
- 22
- 57
8
votes
1 answer
Alternative WMS servers for GOES-East satellite imagery
I'm having some difficulty finding a WMS (web mapping server) for North America GOES-East satellite imagery that matches my needs (visible and IR4, timely, with no alteration of grey-scale pixel values).
I have tried the Iowa State and Nowcoast…
John
- 865
- 5
- 10
8
votes
1 answer
Is the Principle of Fossil Succession accurate?
After wondering on the validity of the principle of Original Horizontality, I'm now focusing on the principle of fossil succession.
This principle states that :
Fossils of species that did not coexist in the same geological period were found to be…
Chirac
- 924
- 1
- 7
- 10
8
votes
2 answers
What are the tectonic implications of the Quaternary Igwisi Hills, Tanzania, kimberlite volcanics?
The Igwisi Hills Kimberlite volcanic features in Tanzania are described in the article Mapping the Igwisi Hills kimberlite volcanoes, Tanzania: understanding
how deep-sourced mantle magmas behave at the Earth`s surface (Brown and Sparks), as being…
user889
8
votes
3 answers
Does the climate have any effect on plate tectonics?
After reading the question and answer Is there any correlation between La Niña/El Niño and seismic activity?, I am wondering if there is any evidence (case studies) to suggest that longer term climatic dynamics (long term trends in seasonality,…
user889
8
votes
1 answer
Laboratory simulation of the Earth's magnetic field
I remember reading an article where a scientist was able to make a spinning iron tube with liquid nickel inside and it created a magnetic field, providing a laboratory-scale simulation of the generation of the Earth's magnetic field by convection in…
Patrick W. McMahon
- 183
- 4
8
votes
1 answer
Release mechanism for methane clathrate at the PETM
The Paleocene-Eocene Thermal Maximum (PETM) is a well-studied warming event near the Paleocene-Eocene boundary.
It is characterized by its extreme warming rate: from onset to recovery the event lasted ca. 100 kyrs, and the global temperature is…
plannapus
- 5,348
- 22
- 57
8
votes
1 answer
Will a volcano erupt in Australia soon?
A Science Daily article Volcanic eruptions long overdue in SE Australia (University of Melbourne, 2011), suggests that a volcanic eruption is potentially "long overdue" in south-east Australia (south-west Victoria and the south-eastern part of South…
user889
8
votes
1 answer
What amount of permafrost carbon release could be expected with the IPCC worse-prediction of a 4.8C temperature rise?
As answered in my earlier question How much methane clathrates are buried in continental deposits?, there is alot of methane trapped in the form of clathrates in continental deposits. Additionally, according to the National Snow and Ice Data Centre…
user889
8
votes
3 answers
How do archaeologists address time dilation when analyzing carbon dating results?
It is a proven fact that the gravitational force exerted upon an object directly affects that objects experience of time; the greater the gravity, the slower time passes, and visa versa. While the rate of radioactive decay may be nearly absolute,…
AdrianBakker
- 97
- 1
8
votes
3 answers
Understanding the Mercator Projection
To illustrate my problem, let's say I have lattitude and longitude coordinates, such as 38.871105, -77.056042.
I want to be able to calculate the new lattitude and longitude if, say, I moved 300m eastwords, or 400m northwards, in a way that google…
bmus
- 81
- 1
8
votes
1 answer
Measuring bed dip angle from contour lines, which lines to pick?
Measuring dip angle of a bed, I choose any 2 contour lines that cross the bed, and then project lines off and measure the angle (I'm assuming this is standard technique that doesn't require explanation)
But it seems (at least with my real world…
Jim W
- 223
- 2
- 6