A jet stream is a fast flowing air current that occurs in the atmosphere of earth and other planets. A global wind belt is formed by the Earth's spin and the unequal heating of the earth via sunlight
The atlatl would have helped hunters throw a spear with enough force to take down larger animals.
From the physics side: this tool allowed the spear to be thrown with greater overall speed and acceleration = more accuracy and force.
Zosimus was the first alchemist
Minerals that grow as crystals in cooling lava can become magnetized if they contain iron.
Igneous rocks are composed of minerals that crystallise at a variety of different temperatures. This explains how a cooling magma could contain some crystals while still being primarily liquid. The Bowen reaction series is the pattern of mineral crystallisation from a magma.
Individual plagioclase crystals can be zoned from more sodium-rich around the exterior to calcium-rich in the centre when cooling occurs reasonably quickly. Because it controls how long the reaction can last before all the silica is consumed, the initial magma's composition is crucial to the crystallisation of magma.
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