GEOL107 Lecture Notes - Lecture 19: Arthur Holmes, Divergent Boundary, Convergent Boundary
Document Summary
Plate tectonics can be defined as working model based on two fundamental plates. These plates are in motion with respect to one another (relative motion) and with respect to underlying lower mantle (absolute motion) Plates move at velocities of 2-16 cm/yr- as fast as your fingernails grow. Crust and mantle are defined based on composition lithosphere and. Lithosphere zone of strength, apply a high enough stress, lithosphere will break asthenosphere are defined based on strength (earthquake) 0-100 km thick beneath oceans 100-150 km thick beneath continents. Movements of lithospheric plates and their interactions as result of their moving create most of major features on earth"s surface (e. g. , volcanoes, mountains, ocean basins) - also determines where most earthquakes will occur. Plates move relative to each other (relative motion) in three ways: There are three types of boundaries associated with these relative motions. Plates moving away from each other - boundary between these two plates called.