Lecture19_EAS1600_Fall08

Lecture19_EAS1600_Fall08 - EAS 1600 Introduction to...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: EAS 1600 Introduction to Environmental Sciences ____________________________ Lecture 19 - Plate Tectonics: Part 2 Types of Plate Motion As illustrated on next page, the interaction of plates depends upon their relative motion: divergent convergent transform and the types of crust is at the edge of each plate: continental oceanic. Why? Recall our discussion about oceanic and continental crust. Do you remember the differences? Why should these make a difference? Types of Plate Motion Divergent Plate Boundaries Lithospheric plates move away from each other. Example: the mid-Atlantic Ridge As the plates move away new crustal aterial is produced. Common feature of divergent plate boundaries in the ocean: smokers; deep sea hot springs Smoker at the Galapagos rift Smokers provide unique environments for microbes that are able to flourish at high temperatures. It is thought that they may have been the cite of the initial evolution of living organisms. BUT: Not all divergent plate boundaries are ocean-ocean boundaries Consider Iceland ... Note: the Mid-Atlantic Ridge passes through Iceland? Aerial view of the area around Thingvellir, Iceland, showing a fissure zone (in shadow) that is the on-land exposure of the Mid-Atlantic Ridge. Right of the fissure, the North American Plate is pulling westward away from the Eurasian Plate (left of the fissure). Large building (near top) marks the site of Lgberg, Iceland's first parliament, founded in the year A.D. 930. (Photograph by Oddur Sigurdsson, National Energy Authority, Iceland.) Photo and caption obtained from USGS onvergent Plate Boundaries he surface area of the earth is finite. If new crustal aterial is being created at divergent boundaries, there ust be convergent boundaries where crustal material is consumed. The consumption of crustal material ccurs as a result of Subduction along a convergent boundary ... ubduction he existence of subduction zones was hinted at well-before the theory of plate tectonics had taken shape......
View Full Document

Page1 / 22

Lecture19_EAS1600_Fall08 - EAS 1600 Introduction to...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online