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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 ___________________.
Chapter 12 Thermal Energy Transfer Drives Plate Tectonics
 Continental drift occurs because ___________________.
 Geologic hot spots are ___________________.