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Geologic time scale

Geologic time scale
Online exhibits Geologic time scale Take a journey back through the history of the Earth — jump to a specific time period using the time scale below and examine ancient life, climates, and geography. You might wish to start in the Cenozoic Era (65.5 million years ago to the present) and work back through time, or start with Hadean time (4.6 to 4 billion years ago)* and journey forward to the present day — it's your choice. Ways to begin your exploration: Use the links in the "time machine" below and explore a specific period that interests you.Read more about the geologic time scale, its origins and its time divisions.Find out more about plate tectonics, an important geological concept in any time period! Related:  Timeline tools and resources.

Civil Rights Movement Timeline (14th Amendment, 1964 Act, Human Rights Law) Jan. 23 The 24th Amendment abolishes the poll tax, which originally had been instituted in 11 southern states after Reconstruction to make it difficult for poor blacks to vote. Summer The Council of Federated Organizations (COFO), a network of civil rights groups that includes CORE and SNCC, launches a massive effort to register black voters during what becomes known as the Freedom Summer. It also sends delegates to the Democratic National Convention to protest—and attempt to unseat—the official all-white Mississippi contingent. July 2 President Johnson signs the Civil Rights Act of 1964. Aug. 4 (Neshoba Country, Miss.)

Le site des dinosaures... Fossils and Geologic Time Photo Credit: Purpose To help students understand the development of the geologic time scale. Also, to introduce students to the major time periods in earth's history, as well as to the role fossils play in helping us understand this history. Context This lesson is based on an online booklet that provides an introduction to the study of earth's history, published by the USGS. Students will likely have been introduced to the geologic time scale in earlier grades, so this lesson is structured loosely to enable you to adapt the content to match the levels and needs of your particular students. Concepts covered in this lesson, including geologic history, age dating, plate tectonics, timelines, and fossils are prerequisite concepts for understanding the theory of evolution, which is another topic taught at this grade level. Planning Ahead This lesson is based on information included in Fossils, Rocks, and Time, part of the United States Geological Survey website. Motivation Development

Hadean: Overview The name Hadean Eon comes from Hades, the underworld of Greek mythology. It refers to the “hellish” conditions of the Earth during the earliest part of its history, when much of the Earth’s surface remained molten. The Hadean Eon of geologic time began with the birth of the solar system, including our planet, Earth, and ended with the formation of the oldest rocks that are still preserved on the surface of Earth. The Hadean is the first period in Earth history, but one for which we have little record. The Earth began to form about 4.6 billion years ago through the condensation of material around the sun. As this material collected, further cosmic material was drawn to it by gravity from all directions, increasing the size of the Earth.

La recherche des temps perdus Échelle du temps en Millions d'années (Ma) List of timelines From Wikipedia, the free encyclopedia This is a list of timelines currently on Wikipedia. §Types[edit] §General timelines[edit] §History[edit] §Arts[edit] §Biographical timelines[edit] §Crime[edit] §Events[edit] §Disasters[edit] §Economics[edit] §Entertainment[edit] §Environmental issues[edit] §Fiction[edit] §Geographical timelines[edit] Timeline of country and capital changes §Ancient civilizations[edit] §Extant civilizations[edit] §Supranational entities and regions, peoples[edit] §Sovereign states[edit] §Subnational regions and cities, narrow timelines[edit] §Law[edit] §Military[edit] §Military conflicts[edit] §Philosophy[edit] §Politics[edit] §Religion[edit] §Ayyavazhi[edit] Timeline of Ayyavazhi history (1809–present) §Buddhism[edit] Timeline of Buddhism (563 BCE – present) §Christianity[edit] §Islam[edit] §Jainism[edit] Timeline of Jainism §Judaism[edit] §Sikhism[edit] Sikh Gurus (1469–1666) §Science[edit] §Astronautics and planetary science[edit] §Astronomy, Astrophysics, and Cosmology[edit] §Biology[edit] §Sports[edit]

Préhistoire Préhistoire Une page pour visualiser d'un seul coup d'oeil les grands événements de la Préhistoire, son histoire, son étude, et aussi celle de l'Homme et de ses ancêtres : les hommes préhistoriques. Préhistoire, une histoire récente... Un peu d'histoire de la Préhistoire... Cela fait maintenant presque deux siècles que l'homme étudie cette période chronologique qui s'étend sur plusieurs millions d'années : la Préhistoire. La vérité vient de la géologie Les études géologiques commencent alors à faire reculer l'âge de la Terre. Histoire de la Terre Les théories de l'évolution Préhistoire - les grandes avancées Le schéma ci-dessous vous présente les avancées majeures de la préhistoire, ou du moins celles dont on a pu trouver et identifier les traces ! Schéma Copyright Neekoo Les premiers outils - 2,5 Millions d'années puis les premiers bifaces vers - 1,3 millions d'années L'une des premières preuves de l'activité humaine qui soit parvenue jusqu'à nous est l'industrie lithique. Yves Coppens

Cenozoic Era Cenozoic Era (65 million years ago to present) The KT Event set the stage for the Cenozoic Era Cenozoic Era that began 65 million years ago. As the dinosaurs perished at the end of the Cretaceous, the mammals took center stage. Even as mammals increased in numbers and diversity, so too did the birds, reptiles, fish, insects, trees, grasses, and other forms of life. Species changed as the epochs of the Cenozoic Era rolled by, with the mammals eventually becoming the largest land animals of the Era, as the dinosaurs had been during the Mesozoic. Tertiary Period (65 to 2.6 million years ago); Also see: Tertiary Fossils Invertebrates, fish and reptiles were similar to those of modern types, but mammals, birds, protozoa and flowering plants would undergo considerable evolutionary change. Paleocene - The Paleocene Epoch began after the extinction of the dinosaurs. Eocene - The first grasses appeared in the Eocene Epoch (from about 54 to 37 million years ago) with growth near the root

Fresque : A la recherche des temps perdus (Académie de Créteil) - Sciences de la vie et de la terre - éduscol SIENE enseigner avec le numérique Service d'Information sur l'Édition Numérique Éducative Portail national éduscol : Sciences de la vie et de la terre Champ de recherche Retrouvez toute l'information sur Accueil Eduscol > Accueil Sciences de la vie et de la terre > Ressources pour enseigner > Ressources par thèmes > Sciences de la Terre > Histoire de la Terre et de la Vie - Chronologie Précédent Retour à la liste Fresque : A la recherche des temps perdus (Académie de Créteil) Version interactive de la fresque 1, permettant d'afficher des explications/ informations présentent un état actuel des connaissances avec ses incertitudes et ses débats. Lien(s) : 2017 - Ministère de l'éducation nationale - Direction générale de l'enseignement scolaire. Éduscol L'Édusphère Plan du site Éduscol Sites thématiques et disciplinaires