Answered: Summarize each piece of EVIDENCE.…

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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Summarize each piece of EVIDENCE. Scientists have measured much more nickel and iron in carbonaceous chondrites than they have found in Earth’s surface rocks and magma. Scientists have observed magnetic minerals in rocks along the Mid-Atlantic Ridge are aligned with Earth’s magnetic field. Scientists observed rocks on both sides of the ridge form identical patterns. Every few million years, the alignment of these minerals reverses. Carbonaceous chondrites (a special type of meteorite) and Earth formed from the same cloud of gas and dust. They should have the same composition, including the same amounts of nickel and iron. Summarize each piece of Reasoning. Because Earth was very hot after it formed, it completely melted. Scientists deduce that most of Earth’s iron and nickel sunk to its core at this time in Earth’s history. Convection occurs in the outer core. Cool, dense matter sinks while warm, less dense matter rises. The flow of this liquid iron creates electric currents, which produce our magnetic fields. Periodically, the flow of fluid changes which results in a reversal of our magnetic field.

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