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Chapter 11

Chapter 11: A Biography of Earth

Geotours

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Using the power of Google Earth, GeoTours take you on flyovers of key locations discussed in the text.

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Dialogue boxes accompanying each site include text, figures, photos.

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System Requirements for Google Earth™

Getting Started :

Geotour 11: Earth Has a History

Paleogeography of the Earth
1a. Check the “Global Paleogeographic Model” folder in the Worksheet 11 folder and make the entire folder semi-transparent. Turn on the latitude and longitude lines (View > Grid) and “Borders and Labels” in the Layers panel. Now, play the time animation through several times and rotate the globe to watch the animation from different perspectives. You also can manually play the animation by grabbing the right part of the time slider and moving it. Leave this folder checked as you answer the following questions.

Check and double-click placemark Problem 1a. Approximately 600 Ma, the continents were combined into one huge supercontinent that was mostly over what present-day ocean?
1b. Check and double-click placemark Problem 1b. Approximately 460 Ma, were the landmasses predominantly in the northern or southern hemisphere?
1c. Check and double-click placemark Problem 1c. In the early Paleozoic, vast areas of the continents were flooded with shallow seas called epicontinental seas (see 420 Ma, for example) where life flourished. How are these areas characterized on the paleogeographic maps?
1d. Check and double-click placemark Problem 1d. Watch the landmass in the center of the view as the animation goes from Problem 1c to 1d (do this a couple of times to study it carefully). This landmass will become North America. During this time period, it is growing by accreting terranes to its margins. What kind of plate tectonic boundary is responsible for these series of mountain-building events?
1e. Check and double-click placemark Problem 1e. A major continent-continent collision is occurring to form what supercontinent?
1f. Check and double-click placemark Problem 1f. What mountain belt does this convergence form?
1g. Check and double-click placemark Problem 1g. When did the supercontinent start rifting apart?
1h. Check and double-click placemark Problem 1h. When did South America and Africa separate?
1i. Check and double-click placemark Problem 1i. Approximately how long did it take India to travel from Antarctica to collide with Asia?

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