Unit 4 Ch. 11 Volcanoes Test Review

Front

What type of lava forms from high silica, high viscosity magma?

Back

A'a

Front

Which islands are an example of those formed over a hotspot?

Back

Hawaiian Islands

Front

What are the properties of viscous magma?

Back

High silica content, high gas content, and flows slowly

Front

What is a lahar?

Back

A type of volcanic mudflow or debris flow

Front

What is the current magnetic polarity considered?

Back

Normal

Front

What was the magnetic polarity 4 million years ago?

Back

Reversed

Front

What type of lava is characterized by smooth, ropy surfaces?

Back

Pahoehoe

Front

What is the term for a volcanic eruption that produces ash and gas?

Back

Plinian eruption

Front

What is the difference between a shield volcano and a stratovolcano?

Back

A shield volcano has gentle slopes and is built by low-viscosity lava, while a stratovolcano has steeper slopes and is built by alternating layers of lava and ash.

Front

What is the term for molten rock beneath the Earth's surface?

Back

Magma