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Question: 1a after tracing the earthquake trends of epicenters using colored...

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1A. After tracing the earthquake trends of epicenters using colored pencil, why do you think that there are small concentrated areas where there are high numbers of earthquakes?

1B. Why do you think that there are large areas where there either is no activity or low numbers of earthquakes?

1C. Why might some areas along the trends have no earthquake activity recorded in the 25 year old record?

1D. Geophysicists have identified seven major tectonic plates. The major ones on which there are continents are the North American plate, Eurasian plate, South American plate, African plate, Australian-Indian plate, and Antarctic plate. There is one plate that is located mostly in the ocean, the Pacific plate. Where are these crustal plates located on the map?

1E. In addition, several intermediate-sized and more than a dozen smaller tectonic plates have been found. The intermediate-sized plates include : the (1-Car) Carribean, (2-Cocos) Cocos, and (3-Naz.) Nazca plates in the Americas; the (4-Phil.) Philippine plate in Asia; and the (5-Arb.) Arabian plate in the Middle East. Where are these plates on the map?

Exercises 1. More than 350,000 earthquakes have been recorded between 1963 and 1998 by a number of government agen- cies, including the National Geophysical Data Center and the National Earthquake Information Center average, there are almost 10,000 earthquakes each year around the world. This means that there are almost earthquakes every day. The locations of the earthquake epicenters (where the earthquake reaches the earths surface) are plotted on the following map. Earthquake Epicenter
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