when did the quaternary period begin and end
Quaternary Quaternary ( /kwəˈtɜːrnəri/) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS).[5] It follows the Neogene Period and spans from 2.588 ± 0.005 million years ago to the present.[5] The Quaternary Period is divided into two epochs: the Pleistocene (2.588 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today).[5] The informal term "Late Quaternary" refers to the past 0.5–1.0 million years.[6]
The Pale The word pale derives ultimately from the Latin word
Hundreds and thousands Hundreds and thousands used incorrectly instead of hundreds of thousands to mean "an indefinite but emphatically large number".
Noise pollution Up until the 1970s governments tended to view noise as a "nuisance" rather than an environmental problem.
Topography These maps show not only the contours, but also any significant streams or other bodies of water, forest cover, built-up areas or individual buildings (depending on scale), and other features and points of interest.
Standard deviation Let X be a random variable with mean value Î¼: