Download Chapter 12 Thermal Energy Transfer Drives Plate Tectonics 12.1

Chapter 12 Thermal Energy Transfer Drives Plate Tectonics
12.1 Evidence for Continental Drift
1. Early maps of the world caused Wegener to propose the ___________________
 The continents looked as though they might fit ___________________.
 The continental shelves actually fit
together even better.
 The original supercontinent was named
_______________ by Wegener.
 Wegener also realized that
___________________.
 There were ___________________.
 There were ___________________, like
Mesosaurus, on different continents.
 There was evidence of different
climates, (eg. Such as
___________________) on warm continents.
Act. 12-1C – Piecing Together Pangaea
2. How Can Continents Move?
• Wegener’s evidence for continental drift did
___________________
 New scientific equipment _________________.
 It was noted that ___________________ appear
in certain patterns along the edges of
tectonic plates.
 Mapping of the ___________________, a long
mountain range running down the middle of the
Atlantic Ocean.
 Rocks taken from the Mid-Atlantic Ridge were ___________________.
 Sediments along the ridge became ___________________.
 Paleomagnetism shows that iron-based rocks along the ridges are
___________________.
3. Sea Floor Spreading: An Explanation
• Hess suggested that ___________________.
 Magma (melted rock) ___________________.
 The convection currents of magma formed
___________________.
 Like a “new crust” ___________________
Magnetic striping of basalt rock shows long
___________________.
Wilson then unified the ideas of Wegener and Hess into
the ___________________.

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2011
Chapter 12 Thermal Energy Transfer Drives Plate Tectonics
 Continental drift occurs because ___________________.
 Geologic hot spots are ___________________.
2011