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In 1902, Italian seismologist Giuseppe Mercalli, created the Mercalli Scale, a new 12-grade scale. Significant improvements were achieved, mainly by Charles Francis Richter during the 1950s, when (1) a correlation was found between seismic intensity and the Peak ground acceleration (PGA; see the equation that Richter found for California).
Download as PDF; Printable version; In other projects Wikidata item; ... Pages in category "Social science indices" The following 36 pages are in this category, out ...
Pupils usually either choose or start their options for their GCSE qualifications in Year 9. In Scotland, Year 9 is the equivalent to Second year (S2) where pupils start at the age of 12 or 13 and end at the age of 13 or 14. In Second year pupils pick subjects for Third year. In Northern Ireland, Year 9 is the second year of Secondary education ...
The a-index is the three hourly equivalent amplitude for geomagnetic activity at a specific magnetometer station derived from the station-specific K-index. Because of the quasi-logarithmic relationship of the K -scale to magnetometer fluctuations, it is not meaningful to take the average of a set of K -indices directly.
The following index is provided as an overview of and topical guide to science: Links to articles and redirects to sections of articles which provide information on each topic are listed with a short description of the topic. When there is more than one article with information on a topic, the most relevant is usually listed, and it may be ...
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School Science and Mathematics, 96 (8), pp. 432–440. Pedretti, E. (1997) Septic tank crisis: a case study of science, technology and society education in an elementary school. International Journal of Science Education, 19 (10): pp. 1211–30. Pedretti, E., & Forbes (2000) From curriculum rhetoric to classroom reality, STSE education.
Examples of determining indices for a plane using intercepts with axes; left (111), right (221) There are two equivalent ways to define the meaning of the Miller indices: [1] via a point in the reciprocal lattice, or as the inverse intercepts along the lattice vectors.