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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