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Hace 3 días · Apart from dating, potassium isotopes have been used as tracers in studies of weathering and for nutrient cycling studies because potassium is a macronutrient required for life on Earth. 40 K occurs in natural potassium (and thus in some commercial salt substitutes) in sufficient quantity that large bags of those substitutes can be used as a radioactive source for classroom demonstrations.
Hace 3 días · Star trails are long-exposure photographs of stars taken as Earth turns, resulting in streaks of light across the sky. Here's how to photograph star trails. Bruce McClure. July 14, 2024.
Hace 1 día · July 29 to 31 evenings: Mercury and Venus. Venus will hang low in the west about 30 minutes after sunset on the last few evenings of July. Tiny Mercury will lie near Venus as well. Look for them ...
30 de jun. de 2024 · Announcement. Earth Surface Processes and Landforms is pleased to announce the appointment of its new Advisory Board.As part if its equality and diversity strategy the membership of women has increased from 24% to 38% and the membership of Global South and BRICs representatives from 11% to 41%. We now have representatives from every continent except Antarctica.
19 de jun. de 2024 · Knowledge of the geochemical distribution of elements involves elucidation of the relative and absolute abundances of the chemical elements in the Earth and in its various parts—the crust, interior, atmosphere, and hydrosphere. This comprises a major part of the science of geochemistry, which is the study of the distribution of the chemical ...
Hace 4 días · The rare-earth elements (REE), also called the rare-earth metals or rare earths or, in context, rare-earth oxides, and sometimes the lanthanides (although scandium and yttrium, which do not belong to this series, are usually included as rare earths), are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals.Compounds containing rare earths have diverse applications in ...
Hace 1 día · Sodium is the sixth most abundant element in the Earth's crust and exists in numerous minerals such as feldspars, sodalite, and halite (NaCl). Many salts of sodium are highly water-soluble: sodium ions have been leached by the action of water from the Earth's minerals over eons, and thus sodium and chlorine are the most common dissolved elements by weight in the oceans.
