Find a
Select grade level(s) Select resource type(s) Select collection(s) Select standard(s) Skip navigation Digital Library for Earth System Education
Digital Library for Earth System Education
Search tips
Why Topography?
Part of the supporting resources for the School of Earth Sciences dynamic earth module, the -Why Topography?- site discusses two models introduced in the 19th century that are still used to explain topographic variations. These models are the Pratt and Airy models of isostasy. In the Pratt model, high topography (relative to surroundings) is due to lower density whereas in the Airy model, high topography is due to thick crust.
Intended for grade levels:
  • High (9-12)
  • College (13-14)
Type of resource:
  • Visual:
    • Illustration - scientific
  • Geological Sciences:
    • Geology
Technical requirements:
No specific technical requirements, just a browser required
Cost / Copyright:
No cost
Copyright and Other Restrictions Information is Unknown.
DLESE Catalog ID: SERC-NAGT-000-000-000-812
Resource contact / Creator / Publisher:
Author: Dr Rob Butler
School of Earth and Environment
University of Leeds