Restless Earth Flashcards
Which tectonic plate is dense?
Oceanic
Which tectonic plate is older?
Continental
Which plate cant be renewed?
Continental plate
What is a destructive subduction?
When the oceanic plate subducts beneath a continental plate
What causes the plates to move?
convection currents
What is a constructive plate margin?
Two plates moving away from each other due to convection currents
What is a conservative plate margin?
When plates slide past each other (San Andreas fault)
On what boundary does a composite volcano form?
destructive subduction (seduction)
What sort of lava does a composite volcano produce?
Andesite lava
What are the properties of andesite lava?
viscous and sticky
Where do shield volcanoes form?
constructive margin
What sort of lava does a composite volcano produce?
basalt lava
What are the qualities of basalt lava?
runny and non viscous
How are fold mountains formed?
geosynclines fill with sediment and over time the geosyncline becomes compressed and they squash and rise up to form fold mountains.
How are ocean trenches formed?
when the the oceanic are formed when the oceanic plate sinks beneath a continental plate at a destructive plate boundary.
