GSU GEOL 1122K - Chapter 2 Visual Quiz (8 pages)

Unformatted text preview:

During subduction one tectonic plate is forced beneath another In this image an oceanic plate is subducting under another oceanic plate What geologic feature is being created in the image a forearc basin a backarc basin a mid ocean ridge a volcanic island arc Subduction commonly leads to volcanism In this case new volcanic islands have been produced This type of activity has given rise to the island nation of Japan as well as the Aleutian Islands extending off the southwest coast of Alaska In the following figure the magnetic anomaly pattern is mirrored on either side of the central ridge What is responsible for this pattern Seafloor spreading builds new crust equally on both sides of the ridge The magnetic anomalies follow a repetitious pattern in mantle convection The anomalies follow El Ni o La Ni a cycles The anomalies follow Milenkovich cycles based on orbital dynamics This image is of a mid ocean ridge These are divergent plate boundaries meaning that new material is created at the ridge As the material spreads away from the central ridge any changes in the Earth s magnetic field will be mirrored almost exactly Multiple types of plate boundaries can often be found in close proximity to one another Below is an image of the Juan de Fuca plate subducting beneath Washington and Oregon in the American Northwest Match the type of plate boundary with the correct letter on the image A Convergent B Divergent C Transform A Divergent B Transform C Convergent A Transform B Divergent C Convergent A Transform B Convergent C Divergent The Juan de Fuca plate is subducting beneath the North American plate at the Cascade trench Spreading centers are indicated by the red bars off shore Arrows show the shear motion of the transform boundaries between spreading centers Paleoenvironmental reconstructions of Pangea indicate that regional climates during the Paleozoic were significantly different than they are today Looking at the following figure which statement about climate and associated rock deposits from the Paleozoic is FALSE Desert sands were deposited in South America Coal swamps were present along the east coast of the United States India was partially glaciated Coral reefs were found in North America Europe and Asia Though South America had both glaciated areas and coal swamps sand dunes were not common to the continent That is very different from today where Peru is home to the Atacama Desert the driest place on Earth The constant motion of tectonic plates leads to convergent divergent and transform plate boundaries Which type of structure is shown in the figure below a subduction zone a mid ocean ridge a passive margin a strike slip fault The image shows where two plates are being pulled apart leading to volcanic activity and faulting This is a submarine divergent plate boundary The distribution of various geological features can be used to recreate what the world looked like millions of years ago This figure shows the location and direction of