Chapter 14 Flashcards
What is NOT an aspect of the theory of plate tectonics?
Deep ocean trenches are tectonically active
What process in the mantle is responsible for the creation of mid oceanic ridges and sea floor spreading?
Convection
What type of plate boundary creates mid oceanic ridges?
Divergent
What is distance about the divergent boundary that forms a rift valley?
It develops within a continent
What type of plate boundary is associated with orogenesis?
Convergent
What plate boundary would be expected where a coastal mountain chain is in proximity to an oceanic trench?
Ocean- continental convergent
What is NOT true regarding transform boundaries?
They’re associated with very little seismic activity
What tectonic phenomenon formed the Hawaiian islands?
Hot spot
What are island chains that become attached to coasts as the plates carrying them subduct?
Accreted terranes
Where are volcanoes least likely to occur?
Transform faults
What type of magmas have high silica content and tend to cause violent volcanic eruptions?
Felsic
What term specifically describes the vast accumulations of lava that build up in layers to great depths and areal extent?
Flood basalts
What type of volcanic peaks have the most gentle flows?
Shield
What type of volcanic peak is steep sided and composed of loose pyroclastics?
Cinder cone
What gas is in the largest quantity when released in a volcanic eruption?
Water vapor
