The Volcanic Explosivity Index (VEI)measures Size of Volcanic Eruptions on a Scale

question 19

Multiple Choice

The volcanic explosivity index (VEI) measures size of volcanic eruptions on a scale of 0 to 8.Between 1500 and 1981,one VEI 7 eruption occurred.This was ______________.

• A)Tambora,in 1815
• B)Krakatau,in 1883
• C)Mt.St.Helens in 1980
• D)Mt.Pelee in 1902
• E)Mt.Vesuvius in 1631

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Definitions:

Earth's Crust

The outermost layer of the Earth, composed of a variety of rocks and minerals; it forms the continents and ocean basins.

Fault

A fracture or zone of fractures between two blocks of rock, which can cause large scale earth movements.

Plates Meet

Regions where tectonic plates come into contact, which can lead to geologic activity such as earthquakes, volcanic eruptions, and the formation of mountains.

Decaying Carbon Isotope

Radioactive isotopes of carbon that decay over time, often used in radiocarbon dating to determine the age of archaeological finds.