Sign up for more inspiring photos, stories, and special offers from National Geographic.Sign Up Legal Terms of Use Privacy Policy Interest-Based Ads Our Sites Nat Geo Home Attend a Live Event Book a Trip Buy Maps Inspire Your Kids Shop Nat Geo Visit the D.C. Museum Watch TV Learn About...
sheets and glaciers, changes in ocean circulation pattern and in sea level, variations of surface and ground water levels and river discharge, glacial-isostatic adjustment, mantle convection and tectonics, all this causes transport and (re-) distribution of mass inside the Earth and at its surface...
Knowledge of the cooling rate of newly formed lower oceanic crust is critical in constraining models of crustal accretion and hydrothermal circulation at m... LA Coogan,GRT Jenkin,RN Wilson - 《Earth & Planetary Science Letters》 被引量: 114发表: 2002年 Oph 1622-2405: Not a Planetary-Mass ...
The soil responses to climatic changes are a key problem in the studies of global change. Soils in the past provide a valuable record for the understanding of the relationship between the soil and the climatic changes. Here we report a case study to the red earth section at Jiujiang City in...
Shortly after sampling, rare earth elements (REEs) from 11.5 l of seawater were concentrated in 35 ml solutions by ion exchange chromatography on board the German research vessel ''Sonne'' using Chelex 100 chelating resin for preconcentration. Two millilitres of a 0.2 μg gLu spike was added ...
Inductively coupled plasma-mass spectrometry (ICP-MS) has been employed to determine the concentrations of rare earth elements( REEs) in plants. For a prompt sample decomposition, a microwave digestion was successfully used with a mixture of HF/HCl4/HNO3. The potential of the method was evaluated...
operation: this concerns the gain as a function of high voltage, charge resolution, peak-to-valley ratio, pulse shape features, correlated pulses (pre-/after-pulses), and, in particular, the photocathode response uniformity and Earth’s magnetic field (EMF) sensitivity of the large volume PMTs...
The calculation of volumes suggest that during the las 17 Ma was stored 761,111 km3 in the Colombia Basin and 25,649 km3 have been accumulated in the continental catchment areas. The sedimentation in the Colombia basin occurs at variable volume rates, with values from 20.000 km3/My to 65...
We analyze the present-day data on the periods of free oscillations and amplitudes of the forced nutations of the Earth for evaluating the admissible range of the mass and moment of inertia for the liquid core. The initial model for this study is taken in the form of the model distribution...
This study is based on data acquired from a grassland field trial in Germany. The site is located in Neunkirchen-Seelscheid (Bergisches Land region, North Rhine-Westphalia), about 30 km southeast of Cologne (50.858986N, 7.312736E). The mean annual temperature is 10 °C and mean annual preci...