Scientific revolutions
Special earth sciences perspectives
Methodology leads to the tenet �the present is the key to the past�
Marine geology and the earth system
Global topography
20 km (13 mi) is a large distance to us. Relative to earth�s radius, however, 20 km is small.
What is the distribution of elevations on earth? Is land area distributed �normally� between the two extreme elevations?
Greatest changes in average elevation occur between 1 and 3 km below sea level
Continents
Continents have rocks of all ages, ranging from those formed yesterday to those formed about 4 Ga ago
Rocks of different origins and ages occur in three fundamentally different geological provinces
Email: steven.wojtal@oberlin.edu
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