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Poisson`s ratio in the lower mantle beneath Alaska: Evidence for
Poisson`s ratio in the lower mantle beneath Alaska: Evidence for

... bulk sound speed and derived Poisson’s ratio variations in the mantle beneath 1000 km depth. We explore the model space using different levels of regularization and our conclusions are based on a range of models that give acceptable data fits. The correlation between vS and vP variations is good to ...
Full Text
Full Text

... calculations (CrunchFlow software) that in unsaturated conditions, water content and [CO2] both control the final equilibrium solute concentration and scale (length or time). In her calculations, [CO2] was more important than water content with respect to overall weathering rate, and increased [CO2] ...
Why Deep Carbon? - Mineralogical Society of America
Why Deep Carbon? - Mineralogical Society of America

... al. (2013) point to dramatic changes in Earth’s near-surface carbon mineralogy through more than 4 billion years of Earth history. The innovation of carbonate biomineralization and the rise of the terrestrial biosphere, in particular, have increased the crustal diversity, volume, and distribution of ...
Homework Problem Set, Chapters 5 and 6, Week 3
Homework Problem Set, Chapters 5 and 6, Week 3

... 1. The total amount of carbon on the earth’s surface depends on a balance between the input of new carbon – from the CO2 derived from volcanism at mid-ocean ridge spreading centers, and the sink of carbon-rich sediments being carried back down into the earth’s mantle at subduction zones. Most variat ...
lect6_geomorphology
lect6_geomorphology

... used directly as a calendar date, because the level of atmospheric 14C is not constant in the past 50Ka. The level is affected by variations in the cosmic ray intensity which is affected by variations in the earth's magnetosphere caused by solar storms. The level has also been affected by human acti ...
replace this sentence with the title of your abstract
replace this sentence with the title of your abstract

... Furthermore, we anticipate that the temperature dependent fractionation of carbon isotopes between iron carbide melt and graphite/diamond is an effective mechanism that created a “12C enriched core” with large scale differences in the distribution of the carbon isotopes in the metallic core and bulk ...
Mathematical Expression of a Global Environmental Catastrophe
Mathematical Expression of a Global Environmental Catastrophe

Slide 1 - kellymurphy
Slide 1 - kellymurphy

... What are the steps of the Nitrogen Cycle – In simple terms!! • Nitrogen exists in the atmosphere as a gas, N2. This Is not usable to plants and animals. It must be converted into a different form to be usable. • Bacteria convert the Nitrogen gas to Nitrates. This is done in nodules in plant roots o ...
1

Radiocarbon dating considerations

The variation in the 14C/12C ratio in different parts of the carbon exchange reservoir means that a straightforward calculation of the age of a sample based on the amount of 14C it contains will often give an incorrect result. There are several other possible sources of error that need to be considered. The errors are of four general types: Variations in the 14C/12C ratio in the atmosphere, both geographically and over time Isotopic fractionation Variations in the 14C/12C ratio in different parts of the reservoir Contamination
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