Tag Archives | Geology

AALENIAN

Lowest stage of the Middle Jurassic period which occurred between 175.6 million and 171.6 million years ago.

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ABANDONMENT

to give up from something with the intent of never again claiming a right to get it back; to leave completely and finally

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ABEL FLASH-POINT APPARATUS

Device which determinates flash point of petroleum products and its mixtures.

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ABRASION

Mechanical scraping of the rocks as a result of friction between rocks and wind, glacier, waves or erosion.

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ABRASION HARDNESS

Also known as wear resistance; degree to which a substance can resist against mechanical damage when in contact with an abrasive material.

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ABSOLUTE AGE

Measurement of age in years. Decay of radioactive isotopes provides information about age of various rocks, fossils, minerals. Absolute age is also known as actual age.

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ABSORPTION PLANT

A facility which removes oils from natural or refinery gas.

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ABUTMENT LOAD

Transfer of weight to adjacent solid rock during deep excavation.

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ABYSSAL

Also known as abyssopelagic layer; it is located near the bottom of the ocean. This zone is characterized by lack of nutrients and light, low temperature and immense presure. All creatures that inhabit abyssal are specially adapted to these conditions.

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ABYSSAL DEPOSITS

Deposits are found predominantly at depths of more than 3000 m. They consists of skeletal parts of plankton organisms, minerals, particles of volcanic origin...

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