By: Michael Totten
London fogs are scientific fact. These notorious pea soup fogs shrouded the actions of Jack the Ripper during his reign of terror on the Victorian streets, and made it difficult for German bombers to follow the Thames to bomb London during World War II. They...
By: Mari Mckee
Schist is a medium grade metamorphic rock following shales, slates, and phylittes, in the rock cycle of metamorphism. Schist means “to split” which is a hallmark of this rock. Schist can be formed from the igneous rock basalt (orthoschists); or from shale, a sedimentary...
Metamorphic rocks: Phyllite
By: Jose Juan Gutierrez
Phyllite is a fine-grained metamorphic rock formed from sedimentary rocks, such as shale and mudstone. A metamorphic rock is created when existing rock is physically and chemically transformed by intense heat and pressure. Phyllite is metamorphosed from shale, its protolith or parent rock. At intermediate...
By: Dr Pandula Siribaddana
The jet stream is a fast moving current of air found in the upper atmospheric levels between 10 to 15 kilometers above the surface of the earth. The stream can be thousands of kilometers in length while its width can stretch for hundreds of kilometers...
By: Patricia Jankowski
Peridotite is an igneous rock, which means that it was formed after molten lava cooled and solidified. It is composed mostly of olivine (a mineral which, when it is gem quality, is the beautiful peridot found in jewelry) and pyroxene, a silicate mineral. It is...
Metamorphic rocks: Quartzite
By: Jose Juan Gutierrez
Quartzite is a non-foliated metamorphic rock composed in its majority of quartz, and formed from the sedimentary rock sandstone. A metamorphic rock is formed when constituent minerals recrystallize in a new molecular arrangement due to tectonic compression and heating. Quartzite is transformed from, its protolith...
By: Janet Grischy
When volcanoes erupt, they may send out flows of scorching lava. They may explosively eject debris high into the air instead, or may eject a combination of flowing lava and exploding debris. Tephra is a volcanologist’s term for the solid materials ejected from volcanoes...
By: Anja Poulsen
Forest fires can cause loss of life and millions of dollars worth of damage. They endanger forest populations and many times any residential areas situated nearby. While the possible danger and destruction from the flames is easy to see, there is at least one other...
What to do if lightning strikes your car
By: Kevin Graham
It is often said that the safest place during a thunderstorm is a car, but how true is this? A car certainly doesn’t seem that safe. One would think the glass could break, or the electricity could penetrate the metal exterior of the car...
Metamorphic rocks: Schist
By: Jose Juan Gutierrez
Schist is a foliated regional metamorphic rock formed from basalts or slate. Schist forms at higher metamorphic grades than slate, although the protolith of both rocks may be the same parent rock stone. Regional metamorphism is caused by Earth’s internal geologic processes, including the...

 

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