Of course, these geologic units are not equal in length. Eons, eras, and periods are usually separated by a significant geologic event and are unique in their climate, landscape, and biodiversity. The Cenozoic era, for example, is known as the "Age of Mammals." The Carboniferous period, on...
TheModern Era, also known as the Modern Age or Modern Period, was a historical time period that spanned the years 1500 to 1945. The Modern Era occurred following the Middle Ages and can be further divided into two time periods: theEarly Modern Periodand theLate Modern Period. The Early Mo...
Literally, "ages" here refers to different eras or time periods, like "The Stone Age", "The Ice Age", and so on. You could use these phrases in informal situations with people you are relatively close to.这太夸张了。这里的“ages”字面意思指不同的历史时代,例如”石器时代”,“冰川时代”...
familiarity with technical geologic terms. After all, geologic time is so broad that it's been divided into more than 20 categories and subcategories.There areeons, eras, periods, epochs, and ages - all of which form a complicated timeline of overlapping (and somewhat simplified) divisions...
Children, Adolescents, and Normative Development In the 1950s the psychoanalyst Erik Erikson proposed that there are four major eras (sometimes called "ages," "periods," or "stages") in the lives of children and an additional one for adolescents (see Table 1). His depiction of childhood ...
While there is debate on the number of different time periods to be recognized as separate time periods, this lesson will cover five distinct time periods. These time periods are thePrehistoric, Classical,Middle Age, Early Modern, and Modern eras. Historians have divided these world eras, or ti...
There are eons, eras, periods, epochs, and ages - all of which form a complicated timeline of overlapping (and somewhat simplified) divisions of time. We've avoided as much technical jargon as possible here, but there's still a lot about geologic time that's just really difficult t...
2.TheconstructionofthegeologictimescaleresultedfromtheworkofmanygeologistswhopiecedtogetherinformationfromnumerousrockexposuresandreconstructedachronologybasedonchangesintheEarth’sbiotathroughtime. 3.Thedivisionofthegeologictimescaleintoeons(宙),eras(代),periods(纪),epochs(世),andages(期),wasprimarilybasedonchange...
Each eon - Hadean, Archean, Proterozoic, and Phanerozoic Eons must be further broken down into eras, time periods, and epochs Time labeled in millions of years ago (m.y.a.) Detailed description of the ages within each epoch, noting life, climate, and geography ...
geological era,era- a major division of geological time; an era is usually divided into two or more periods epoch- a unit of geological time that is a subdivision of a period and is itself divided into ages Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton Universit...