1 / 17

Drifting Continents (pages 136–140)

Drifting Continents (pages 136–140). Continental Drift (pages 137–139) Key Concept: Alfred Wegener’s hypothesis was that all the continents were once joined together in a single landmass and have since drifted apart.

faolan
Download Presentation

Drifting Continents (pages 136–140)

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. DriftingContinents (pages136–140)

  2. ContinentalDrift(pages137–139)Key Concept:AlfredWegener’shypothesis was thatall the continents were once joined together in asingle landmass and have since drifted apart.

  3. Wegener gathered evidencefromdifferent scientificfields to support his ideas about continental drift.Hestudiedlandfeatures,fossils,andevidenceofclimatechange.

  4. Continental Drift Video

  5. Some continents are shaped like puzzle pieces.Forexample, the west side of Africa and the east side ofSouth America look like matching puzzle pieces.

  6. Scientist AlfredWegener(VAYguhnur)tried toexplainwhy continents are shaped this way.

  7. WegenerthoughtthatEarthhadonebigcontinentabout300 million yearsago.The big continent broke intosmaller pieces and formed smaller continents.Thecontinents slowly drifted apart.Wegener called thiscontinental drift.

  8. Evidence shows that continental drift really happened.MountainrangesinAfricaandSouthAmericalineupasif theywere once part of the same mountain range.

  9. Otherevidenceshowsthatcontinentsoncehaddifferentclimates.This could happen if continents had drifted.

  10. Wegener called the slow movement of continents Continental Drift

  11. Circle the letter of the drawing that shows how Wegener thought South America and Africa were once joined as part of a single, giant continent. B A

  12. Circle the letter of evidence that supportsWegener’sidea of continental drift. a. Mountain ranges on different continents line up. b. Evidence shows that climates have not changed. c. Old maps show that Earth had a single, giantcontinent about 3,000 yearsago.

  13. Wegener’sHypothesisRejected(page140) Key Concept:Unfortunately,Wegener could notprovide a satisfactory explanationfor the force thatpushes or pulls the continents.

  14. Wegener could not explain what causes continentaldrift.Somostotherscientistsofhistimethoughtthathewas wrong.

  15. Wegener used his idea of continental drift to explainhow mountains form.Wegener thought mountains formbecausedriftingcontinentsbumpintoeachother.Whenthis happens, edges of the continents crumple.Thecrumpled edges formmountains.

  16. true or false? • Wegener’s ideas were accepted by most other scientists of • his time FALSE

  17. Circle the letter of the sentence that describes howWegener thought mountains form. a. Earthslowly cools and shrinks. b. Continents drift apart. c. Continents bump into each other.

More Related