Volcanoes Are Generally Not Preserved in the Geologic Rock Record

question 43

Essay

Volcanoes are generally not preserved in the geologic rock record as they are eroded away. However, the various materials erupted from volcanoes are often found preserved in the rock record. How could you infer what type of volcano erupted in a given area based on the type of volcanic deposits now found as layers of rock? Give specific examples and briefly discuss if some materials may be linked to different types of volcanoes.

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Definitions:

Flexible Exchange Rates

A foreign exchange system where the value of currencies is determined by market forces without direct government intervention.

Libras

A constellation in the zodiac, symbolized by the scales, or in a financial context, might be mistaken for "libra," which refers to a unit of weight or a former currency.

Freely Floating Exchange Rates

Exchange rates that are determined by the supply and demand for currencies in the foreign exchange market without direct intervention by countries' governments.

Imports

Goods or services brought into a country from abroad for sale, contrasted with exports, which are sent out of a country.