Tectonic Processes and Hazards Keywords

Question 1

Basalt

Answer 1

Fine-grained, igneous rock, underlying more of the earth’s surface than any other rock type, especially ocean basins. Associated mainly with constructive plate boundaries.

Question 2

Andesite

Answer 2

Typically in lava flows produced by stratovolcanoes. Generally formed after an oceanic plate melts during its decent into subduction zone.

Question 3

Rhyolite

Answer 3

Formed from granitic magma in continental or continent margin volcanic eruptions where granitic magma reaches the surface. Rhyolite is rarely produced at oceanic eruptions.

Question 4

Benioff Zone

Answer 4

A dipping flat zone where earthquakes are produced by the interaction of a down going oceanic crustal plate with a continental plate.

Question 5

Subduction Zone

Answer 5

The place where two lithospheric plates come together, one riding over the other. Most volcanoes on land occur parallel to and inland from the boundary between two plates.

Question 6

Crustal Facturing

Answer 6

Occurs when the earth’s crust causes rock to break and fracture under stress and strain caused by seismic stress.