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Protactinium is a chemical element; it has symbol Pa and atomic number 91. ... Ocean science utilizes the element to understand the ancient ocean's geography.
Protactinium(V) fluoride can be prepared by reacting protactinium oxide with either bromine pentafluoride or bromine trifluoride at about 600 °C, and protactinium(IV) fluoride is obtained from the oxide and a mixture of hydrogen and hydrogen fluoride at 600 °C; a large excess of hydrogen is required to remove atmospheric oxygen leaks into the ...
Also amphidrome and tidal node. A geographical location where there is little or no tide, i.e. where the tidal amplitude is zero or nearly zero because the height of sea level does not change appreciably over time (meaning there is no high tide or low tide), and around which a tidal crest circulates once per tidal period (approximately every 12 hours). Tidal amplitude increases, though not ...
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
Glossary of geography terms may refer to: Glossary of geography terms (A–M) Glossary of geography terms (N–Z) This page was last edited on 25 ...
A 5-year-old killed in a hyperbaric chamber fire last month in Michigan was receiving treatment for sleep apnea and ADHD, said an attorney for his family.
There’s no official definition for either of these accounts. Rather, each is a type of deposit account that can earn you incremental interest on your balance, helping you to grow your savings.
President Trump will on his first day in office Monday issue an order defining a person's sex as "male or female" — requiring government agencies to use the "immutable" designation on forms and ...