Scientific revolutions

2/5/03


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Table of Contents

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

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

Rocks of different origins and ages occur in three fundamentally different geological provinces

Rocks of different origins and ages occur in three fundamentally different geological provinces

Rocks of different origins and ages occur in three fundamentally different geological provinces

Author: Steven Wojtal

Email: steven.wojtal@oberlin.edu

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