Volcanoes - Geology Worksheet printable pdf download

Physical Geology 101

10. Volcanoes I

(p. 126-149)

Volcano Statistics

How many volcanoes erupt on land or in shallow water every year? ____________

How many volcanoes have erupted in the USA in the past 200 years? ___________

How many volcanoes in the world emit rocks, ash, gas or lava every day? ___________

Examples of 5 volcanoes that have shown eruptive activity in the past week:

_______________________

How many active volcanoes are there in the world? ___________

How many people live on or near these volcanoes? _______________

In the past 500 years, there have been 7 catastrophic eruptions that have killed more than ____________

people at a time. Since 1800, there have been 19 eruptions that have killed more than 1,000 people.

Potential volcanic hazards:

__________________ – e.g. Hawaii, Iceland, Democratic Republic of Congo, Mexico

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__________________ – e.g. Galeras, Colombia

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__________________ – e.g. Mt. Vesuvius, AD79; Mt. St. Helens, 1980; Pinatubo, 1991

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__________________ – effects: respiratory ailments and collapsed roofs; e.g. Pinatubo

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__________________ – e.g. Lake Nyos, Cameroon, 1986 – 1,700 people killed

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__________________ – e.g. Armero, Colombia, 1985 – 25,000 killed; Mt. Rainier, WA.

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__________________ – pyroclastics, rocks, trees, etc. - e.g. Nevado del Ruiz, Colombia

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__________________ – e.g. Krakatau, Indonesia, 1883 – eruption created a tsunami that

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killed >35,000 people.

__________________ – e.g. Kalapana, Hawaii, 1975 (also caused a tsunami)

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Additional causes of death in the long-term: _________________________________

The most destructive known volcanic episode happened about 251 million years ago in Russia, forming a large

region of basalt lava flows called the _______________________. The lava from that eruption covered a million

square miles and resulted in the death of 90% of all sea life and 70% of all land creatures- an extinction level

event of global proportions.

Since then, there have been 9 other enormous floods of basalt onto the Earth's surface.

Volcanoes - Geology Worksheet