The face of places, and their forms decay;
And that is solid earth, that once was sea;
Seas, in their turn, retreating from the shore,
Make solid land, what ocean was before.
- OVID, Metamorphoses, XV
The hills are shadows and they flow
From form to form, and nothing stands;
They melt like mist, the solid lands,
Like clouds they shape themselves and go.
- Tennyson
Types of crust
OceanicCraton
Continental
ShieldMobile Belts
Platform
Mountain BeltsPlate Boundaries (margins)
Piedmont
DivergentTests of Wegner's Theory
Convergent
Transform
Benioff ZoneHotspots
Dating Oceanic crust
Triple Junctions
Breakup of a continent
Useful links:
Earth Science Picture of the Day
Return to Historical Geology syllabus
Return to Historical Geology syllabus