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GG 103 Media Topics Example

Michael Lane
GG 103
MWF 9:00-9:50
Fall 2012

First Media Topic

This article was published on 8/25/04 in the Honolulu Advertiser. The title is Study says 'hot spot' that created Island chain drifted.

The article discusses evidence that the Hawaiian hot spot drifts.

The magma that forms the Hawaiian Islands is generated in the mantle. The mantle is part of the density structure of Earth, which consists of three layers: the crust, the mantle, and the core. The crust is on the outside and the core is on the inside. Early in the history of Earth, it segregated by density. The more dense elements sank to the core, and the least dense elements rose to the crust. This segregation resulted in compositional differences. Therefore each layer has a different average composition. The crust is mostly Al silicate, whereas the mantle is mostly Fe, Mg silicate, and the core is mostly Fe.