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A hypothesis is a scientific theory that has been tested.

How does the global distribution of earthquakes relate to the plate boundaries?

Global positioning systems (GPS) are a reliable way to measure plate movements.

Contrast igneous rock textures between those formed internally (intrusively) and those formed externally (extrusively).

The person in the figure below was encased by a pyroclastic flow.  

_______ igneous rocks are composed of dark-colored minerals rich in magnesium and iron.

Igneous rocks high in feldspars and silicates are known as felsic rocks.

Discuss how large eruptions like Mt. Pinatubo in 1991 and Tambora in 1815 affected Earth’s climate.

The phenomenon of the Earth’s magnetic pole being in different locations in the past is known as _______.

In the figure below, _______ is the process that occurs when newly formed crystals are lighter than magma and float to the top of the magma chamber