Earth Science Weekly Newsletter - Wednesday, July 30, 2014

Earth Science newsletter

Top new questions this week: Why is there Uranium in Earth's Crust? Uranium's density is greater than most elements, so you would expect it to settle to the bottom of a volume of fluid. In the case of the Earth, which was molten in the beginning, you might then expect … geophysics geochemistry   asked by Lukasz 9 votes answered by David Hammen 7 votes Formation of limestone without living organisms? Limestones are formed mostly from skeletal fragments of marine organisms. However, calcium carbonate dissolves naturally in water, so the living organisms are not the only source of it in water. Is … sedimentology rocks limestone   asked by Lukasz 7 votes answered by winwaed 4 votes Can earthquakes contribute to Antarctic ice loss? I read about the earthquake that took place in Japan in 2011, led to some small calving events in Antarctica (link). So, it makes me think if there is a big earthquake near or in Antarctica, can it … earthquakes ice-sheets antarctica ice   asked by Vikram 7 votes How could humans alter storm intensity or direction other than cloud seeding? I am familiar with the concept of cloud seeding, where precipitation can be induced with aerosols, thereby altering storm intensity further downwind. Are there methods that could be used to … meteorology wind storms technology   asked by farrenthorpe 6 votes How will increased CO2 affect forests and other vegetative areas? Some researchers contend that increases in atmospheric CO2 (e.g. from anthropogenic emissions) will enhance plant growth in general. What is the level of that enhancement? Does the associated … climate-change forest carbon co2   asked by farrenthorpe 6 votes answered by taupunkt 2 votes How long does it take to form amber? How long does the formation of the amber take? Are there any approximation of the minimal time needed to convert resin into amber in the most favorable conditions? Would it be possible to produce … amber   asked by Lukasz 5 votes Are there significant amounts of rare earth elements on Iceland? The rare earth elements form in magmatic rocks. The Iceland is very active vulcanic region, and it's, to my knowledge, entirely build from magmatic rocks. So it wouldn't be surprising if there were … geochemistry resources rare-earth   asked by Lukasz 4 votes Greatest hits from previous weeks: What is the status of the Raymo & Ruddiman idea that Tibet cooled the Earth? What is the current status of the Raymo & Ruddiman hypothesis that the uplift of the Tibetan Plateau during the Cenozoic cooled the Earth, resulting the current ice age(*)? cf. Raymo, M.E. and … paleoclimatology carbon-cycle tibetan-plateau   asked by winwaed 19 votes answered by plannapus 19 votes Why do snowflakes form into hexagonal structures? Snowflakes are known to form into pretty hexagonal structures. The image below shows a variety of such structures that are possible (although by all means not an exhaustive list): What is the … meteorology snow crystallography   asked by Geodude 25 votes answered by casey 22 votes Can you answer these? Geometrical differences of subduction zones I am looking for geometrical differences in subduction zones. What are the differences, in dip, curvature of the interface, thickness of the plates etc.? There are differences between the Chile and … subduction   asked by traindriver 3 votes Mountain ranges eons ago In New Delhi, a lot of people say that the Aravali range used to be as tall as the Himalayas. How do scientists know that some mountain range used to be a lot taller millions of years ago, and what … mountains   asked by theVerma 3 votes

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