Quiz 5 EES

The chain of volcanoes along the west coast of South America (the Andes Mountains) exists because

an oceanic plate is subducting under the western edge of the South American Plate.

Marine magnetic anomalies result from seafloor spreading in conjunction with

magnetic polarity reversals.

Order the steps of volcanic island arc formation

1. A subduction trench forms 2. An accretionary prism begin to form. 3. Magma created by flux melting...... 4. Lava erupts onto the surface, forming volcanoes

Name the person who proposed the hypothesis of continental drift.

Alfred Wegener

As the map below shows, the oldest seafloor is generally less than 200 million years old. Why?

All oceanic lithosphere eventually gets subducted beneath the continents by the time it is 200 million years old.

Contrast continental collision and volcanic island arc formation. Sort properties of each.

Continental Collision - involves continental crust Volcanic Island Arc Formation - involves volcanism involves oceanic crust involves subduction

Match the geologic activity to the plate boundary where it occurs.

Convergent - deep and shallow earthquakes recycling of old oceanic crust volcanic arcs Divergent new oceanic crust shallow earthquakes and volcanic activity Transform earthquakes but no volcanic activity

This diagram shows a convergent plate boundary. Which of the following statements is true?

E. This is an example of ocean-continent convergence; the plate on the right is being subducted.

Alfred Wegener proposed the idea of continental drift after he observed evidence from fossils, glacial deposits, and the fit of the continents that suggested all of the continents were once

combined to form a supercontinent (which he termed Pangaea) in the late Paleozoic through the Mesozoic.

The center of a mid-ocean ridge is where

new oceanic lithosphere is being created.