This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: continents. Oceanic ridges generate new crust at the rate of 17 km 3 per year, whereas at the continental boundaries a similar amount of material is subducted and recycled. Plate tectonics This continual movement of the continents can be traced back in time: see for example Beatty and Chaikin or a Geology/Palaeontology text book for the development of the continents from Gondwanaland and Pangea 100s of millions of years ago....
View Full Document
- Fall '10