Earth Science Week is an annual international celebration of the geology all around us. Coordinated by the American Geosciences Institute in the US, and the Geological Society in the UK and Ireland, the week now also takes place in an increasing number of countries worldwide. 2018’s Earth Science Week was bigger than ever! This year, … Continue reading →
The American Association of Geographers has named Rita Colwell, the first woman to be director of the National Science Foundation (NSF), as its 2019 AAG Honorary Geographer. Rita Colwell currently is a distinguished university professor at the University of Maryland at College Park and at Johns Hopkins University Bloomberg School of Public Health, a senior […]
proton-precession magnetometer (pro'-ton-pre-ces'-sion). A type of nuclear resonance magnetometer that accurately measures absolute total magnetic intensity by the use of the precession of protons in a hydrogen-rich liquid (such as water) about the magnetic field direction. Precession frequency is proportional to field strength. See also: proton-vector magnetometer.
LO-analysis . A palynological method for analyzing the sculpture and structure of the sexine by comparing the elements in high and low focus. In high focus, raised elements are bright ("lux"), holes are dark ("obscuritas"). At low focus, this pattern is reversed.
Schoenflies notation (Schoen'-flies). A system of describing crystal classes by means of symbols used esp. by physicists and chemists. Cf: Hermann-Mauguin symbols. Syn: Schoenflies symbols; international symbols.
peel technique . A method of preparing rock sections for study. A smooth surface is differentially etched with acid, and then covered with cellulose acetate or a similar liquid that will dry to a transparent film. When this film is peeled off, it brings with it a thin layer of rock substance, preserving this material in its original space relations. It may then be studied microscopically.