Monday December 5, 2011 (Introduction to Plate Tectonics )

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Presentation transcript:

Monday December 5, 2011 (Introduction to Plate Tectonics )

The Launch Pad Monday, 12/5/11 In which rock layer would you not find dinosaur fossils? Why?

Assignment Currently Open Summative or Formative Date Issued Date Due Date Into Grade Speed Last Day Activity – The Geologic Time Scale “Cheat Sheet” F411/1111/1512/212/6 Lab – The Geologic Time Scale F511/1511/18 Quiz 11S211/18 12/9 Video WS – Historical Geology – A Glimpse of the Earth’s Past F612/1 Quiz 12S312/2 12/16

Announcements I will be available after school today until 5:00.

Latest News None today

Introduction to Plate Tectonics

Figure 1.18 (left)

Figure 1.18 (right)

The Earth’s lithosphere is divided into plates, which move on top of the asthenosphere New crust is created at mid- oceanic ridges.

Plates move apart (divergent) and crash together (convergent) Plate tectonics – convection from the asthenosphere causes an upwelling through the lithosphere.

Living Rock An Introduction to Earth’s Geology Video 5 th Period Only

Video Greatest Discoveries Bill Nye 7 th and 8 th Periods Only

The Launch Pad Monday, 11/1/10 Why do modern birds show more of a similarity to modern reptiles than modern mammals show to modern reptiles? Birds branched off from reptiles much later than mammals did, thus retaining more of a similarity.

Continental Drift An Idea Before Its Time German scientist Alfred Wegener first proposed the continental drift hypothesis in His work was published as “The Origin of Continents and Oceans.” The continental drift hypothesis states that a supercontinent called Pangaea began breaking apart about 200 million years ago. The continents “drifted” to their present positions. Continents “broke” through the ocean crust.

Antonio Snider-Pellegrini (1858) Alfred Wegener’s Pangaea

Pangaea approximately 200 million years ago Figure 7.2

Continental Drift Evidence Cited by Wegener Fit of South America and Africa

Continental Drift Evidence Cited by Wegener Fossils match across the seas

Continental Drift Evidence Cited by Wegener Fossils match across the seas

Continental Drift Evidence Cited by Wegener Fossils match across the seas

Continental Drift Evidence Cited by Wegener Rock types and structures

Similar mountain ranges on different continents Figure 7.7