1 / 14

Lesson 2: Ancient Earth

Lesson 2: Ancient Earth. ??. Essential Questions. How did gravity affect Earth’s formation ? How did the oceans and atmosphere form ? What conditions made early Earth able to support life ? How did environmental changes affect the evolution of life ?. Vocabulary. Hadean eon

luka
Download Presentation

Lesson 2: Ancient Earth

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lesson 2: AncientEarth

  2. ?? EssentialQuestions • HowdidgravityaffectEarth’sformation? • Howdidtheoceans and atmosphereform? • WhatconditionsmadeearlyEarthabletosupportlife? • Howdidenvironmentalchangesaffecttheevolution of life?

  3. Vocabulary • Hadeaneon • Archeaneon • Protocontinent • Proterozoiceon • Thermalenergy

  4. Earth’sEarliestHistory • Gravity and the Solar System • BeforeEarthoreventhe solar systemexisted, a cloud of gas, ice, and dust, called a nebula, floated in space

  5. Earth’sEarliestHistory • First: Gravitypulledtheparticulestogetherinto a flattened disk shape and begantorotate. • Second: the material in the center became dense and theSunformed • Third: theremainingpieces of material in the disk attractedeachother and planetswereformed

  6. SphericalEarth • As more particles come togetherEarthbecamelarger. • Thermalenergyisproducedbycollisions, whichwarmedtheplanet. • AsteroidscontinuedtocrashintotheEarthsurface, makingitevenhotter.

  7. HadeanEon, ArcheanEon, ProterozoicEon

  8. HadeanEon Thefirst 640 millionyears of Earthhistory

  9. HadeanEon • Thefirst 640 millionyears of Earthhistory • Formation of Earth’sCore • A hotEarthcools • Seas of Molten Rock • Changes in the Seas • TheAncientAthmosphere

  10. ArcheanEon Fromabout 4 to 2.5 billionyearsago

  11. ArcheanEon • Earthcontinuestocool and firstsolidsurfaceappeared, butstilltwice as muchinternalthermalenergywasproduced at that time, comparingtonowadays. • VolcanicActivity • As magma risedtothesurfacethroughcracks in theoceanfloorit has formedEarthfirstoceaniccrust. • TheEarliestContinents • Protocontinents: small and earlycontinentswhichhavecollidedbetweeneachotherformingbiggerlandmasses • Earth’sOceansForm • Fossil bacteria and stromatolites are theearliestevidence of lifepresent in rocks. They are uncommon and difficulttoseeduetotheirmicroscopicsize. • TheArcheanoceanswere extreme environments, mostorganismsalivetodaywouldnothavesurvivedthen.

  12. ProterozoicEon From 2.5 to 0.542 billionyearsago

  13. ProterozoicEon • Changes in theAtmosphere: Earthwascoolingdown and largerlandmasseswereformed. • Increase in Oxygen • SnowballEarth • Supercontinents and Shallow Seas • ProterozoicLife • Unicellularorganisms in water. • Firstmulticellularorganisms in theocean, buthad no hardparts, so fossilsaren’tabundant.

  14. Homework • Textbook: Page 94 #2, 3, 4 • Workbook: Page

More Related