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The phenomenon of salt fingers
Fingers salt small disturbances in the water, the researchers believe. Small parcels of warm water enter the colder water below and cool rapidly; heat diffuses faster than salt. Once it's cooler the parcel can hold less salt and the salt precipitates out, forming crystals that dsink to the lakebde.

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SARS-Cov2 is a rna virus that attacks the lungs mainly , but occasionally the upper respiratory tract in some variants.
The virulence of this virus comes from its ability to spread quickly between individuals and inside the respiratory system, regarding molecular virology , this virulence is based on the spike protein on the envelop of the virus which has high attachment ability to respiratory system cells.
Historically , this is a new generation of corona viruses after MERS and SARS in 2014.
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S9.4 الماء سر الحياة

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S9.3 كيف يفكر العلماء وكيف يعملون؟

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المعادن S9.2

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S9.1 مشكلة عالمية

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A micrometer is a SI unit of length equal to one millionth of a meter, denoted by µm. The micrometer is one of the most accurate dimensions measuring devices available in workshops and laboratories, as its accuracy is usually 0.01 mm, and in some devices it may reach a value less than 0.001 mm.

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يقين ابو سماحة

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يقين ابو سماحة

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يقين ابو سماحة

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يقين ابو سماحة

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يقين ابو سماحة

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يقين ابو سماحة

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يقين ابو سماحة

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يقين ابو سماحة

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S9.1.B رحلة في الجهاز الهضمي

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S9.2.B الآلات البسيطة في حياتنا

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An inclined surface, also known as an inclined plane, is a surface inclined at an angle from a horizontal surface such that its ends are at two different heights. The sloped surface is used to facilitate the lifting of objects on its surface so that the force required for lifting is less than it is vertically on the horizontal surface.#inclined .#plane
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hematite It is the raw material for the production of iron. Hematite crystallizes in the triclinic crystal system and has the same crystal structure as the minerals ilmenite and corundum.#hematite

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Magnetite is one of the ores from which iron is extracted. This metal is used to make permanent magnets. This metal is one of the oxides of iron, and it is characterized by being quickly attracted to a magnet, which is why it is called black in color, shiny, and has a high density.#Magnetite