Exam 11: Volcanic and Tectonic Processes and Landforms

________________ are deep fractures out of which molten rock material pours.

Igneous means ________________ in Latin.

Everything else being equal, more effusive eruptions will occur in molten rock material of ____.

The strike of a rock is the angle it is inclined from the horizontal.

Tephra is the same as ____.

The modified Mercalli scale ____.

A layer of rock that is inclined from the horizontal is described as having a __________________ of, for example, 25° to the northwest.

A sill is a ____ feature.

The slippage or displacement of rocks along a fracture surface is called ____.

The downtilt of a rock layer is described by its ____.

What factors determine whether a volcanic eruption is explosive or effusive? What are some ways in which the landforms created by the two different types of eruption differ?

Shield volcanoes are ____.

Pahoehoe is best described as ____.

A lava flow is an example of an effusive volcanic eruption.

Faults that have vertical displacement and have resulted from tensional forces are called ____.

Strike-slip faults are caused by shearing tectonic forces.

The modified Mercalli scale measures ____.

Compressional tectonic forces may result in the formation of ____.

Composite cones ____.

Joints are ____.