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Metamorphism - Wikipedia
Metamorphism is the transformation of existing rock (the protolith) to rock with a different mineral composition or texture.Metamorphism takes place at temperatures in excess of 150 to 200 °C (300 to 400 °F), and often also at elevated pressure or in the presence of chemically active fluids, but the rock remains mostly solid during the transformation.
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Metals and Other Trace Elements | U.S. Geological Survey
Mar 01, 2019 · Metals, metalloids, and radionuclides all are trace elements that occur naturally in the Earth's crust. In small quantities many trace elements are essential for health in all living organisms, but some trace elements can be toxic or cause cancer, and some can bioaccumulate. The USGS investigates where and how trace elements make their way into our Nation's …
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Oceanography - Wikipedia
Oceanography (from Ancient Greek ὠκεανός (ōkeanós) 'ocean', and γραφή (graphḗ) 'writing'), also known as oceanology and ocean science, is the scientific study of the oceans.It is an important Earth science, which covers a wide range of topics, including ecosystem dynamics; ocean currents, waves, and geophysical fluid dynamics; plate tectonics and the geology of the …
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Shale: Sedimentary Rock - Pictures, Definition & More - Geology
An accumulation of mud begins with the chemical weathering of rocks. This weathering breaks the rocks down into clay minerals and other small particles which often become part of the local soil. A rainstorm might wash tiny particles of soil from the land and into streams, giving the streams a "muddy" appearance.
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Science definition - What is science? - Science Made Simple
According to Webster's New Collegiate Dictionary, the definition of science is: "knowledge attained through study or practice," or "knowledge covering general truths of the operation of general laws, esp. as obtained and tested through scientific method [and] concerned with the physical world."
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Biophysical environment - Wikipedia
A biophysical environment is a biotic and abiotic surrounding of an organism or population, and consequently includes the factors that have an influence in their survival, development, and evolution. A biophysical environment can vary in scale from microscopic to global in extent. It can also be subdivided according to its attributes. Examples include the marine environment, …
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Formation Definition & Meaning | Dictionary.com
Formation definition, the act or process of forming or the state of being formed: the formation of ice. See more.
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Bioaccumulation - Wikipedia
Bioaccumulation is the gradual accumulation of substances, such as pesticides or other chemicals, in an organism. Bioaccumulation occurs when an organism absorbs a substance at a rate faster than that at which the substance is lost or eliminated by catabolism and excretion.Thus, the longer the biological half-life of a toxic substance, the greater the risk of chronic poisoning, …
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Limestone: Rock Uses, Formation, Composition, Pictures - Geology
Limestone is by definition a rock that contains at least 50% calcium carbonate in the form of calcite by weight. All limestones contain at least a few percent other materials. These can be small particles of quartz, feldspar, or clay minerals delivered to …
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Scree - Wikipedia
Scree is a collection of broken rock fragments at the base of a cliff or other steep rocky mass that has accumulated through periodic rockfall.Landforms associated with these materials are often called talus deposits.Talus deposits typically have a concave upwards form, where the maximum inclination corresponds to the angle of repose of the mean debris particle size.
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