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Quaternary period
(Encyclopedia) Quaternary periodQuaternary periodkwətûrˈnərē [key], younger of the two geologic periods of the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table)…epoch
(Encyclopedia) epoch, unit of geologic time that is a subdivision of a period. The Pleistocene and Holocene epochs, for example, are divisions of the Quaternary period. Epoch is also used to describe…Cenozoic era
(Encyclopedia) Cenozoic eraCenozoic erasēnəzōˈĭk, sĕn– [key], last major division of geologic time (see Geologic Timescale, tablegeologic timescale, table) lasting from 65 million years ago to the…pressure-treated wood
(Encyclopedia) pressure-treated wood, wood that has had a liquid preservative forced into it in order to protect against deterioration due to rot or insect attack. The most commonly used…Tertiary period
(Encyclopedia) Tertiary periodTertiary periodtûrˈshēĕrˌē [key], name for the major portion of the Cenozoic era, the most recent of the geologic eras (see Geologic Timescale, tablegeologic timescale,…Geologic Timescale (table)
(Encyclopedia) Geologic Timescale Era Period Epoch Approximate duration (millions of years) Approximate number of years ago (millions of years) Cenozoic Quaternary Holocene 10,000 years ago to…Anatomy and
Physiology: Cells, Bells!
Cells, Bells!Anatomy and
PhysiologyThe Circulatory SystemCells, Bells!Blood Types and GeneticsNow I Know My WBCs
My first introduction to white blood cells was that old sci-fi classic, Fantastic…Geology of the Grand Canyon: Base Levels Of Erosion.
BASE LEVELS OF EROSION.In his popular narrative of Explorations of the Colorado River, Powell has employed the above term to give precision to an idea which is of much importance in physical…The Chemistry of Biology: Proteins
ProteinsThe Chemistry of BiologyIntroductionAtomic TheoryChemical Reactions: Ionic, Covalent, and Polar Covalent BondsWaterOrganic ChemistryCarbohydratesLipidsProteinsNucleic AcidsVitamins and…glacial periods
(Encyclopedia) glacial periods, times during which large portions of the earth's surface were covered with thick glacial ice sheets. In the Pleistocene epoch, in the Carboniferous and Permian periods…Trending
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