L4 + L5 Vocab Exam 1 Flashcards
Accretionary Prism
A wedge shaped mass of sediment and rock scrapped off the top of a downging plate and accrected onto the overriding plate at a convergent plate margin.
Apparent Polar wander path
A path on the globe along which a magnetic pole appears to hve wandered over time.
Curie Point
The temperature at which rocks and minerals lose their permanent magnetisation.
Collison
The process of two buoyant pieces of the lithosphere coverging and squashing together.
Contential Rift
A liner belt along which contential lithospher streches and pulls apart.
Convection
Heat transfer that results when warmer, less dense material rises while cooler, denser material sinks.
Convergent Boundary
A surface across which two plates move towards each other so that one plate sinks beneath the other.
Dipole
A magnetic feild with a north and south pole like that of a bar magnet.
Magnetic Feild
The region affected by the force emanating form a magnet
Magnetic inclination
The angle between a magnetic needle free to pivot on a horizontal axis and a horizontal plane parallel to the Earth’s surface
magnetic declination
The angle between the direction a compass needle points at a given location and the direction of true north.
Paleomagnetism
The record of ancient magnetism pressured in rock
Marine magnetic anomalies
Variation of strength of Earths magnetic Field caused by magnetism in rocks of the ocean floor.
Normal polarity
Polarity in which the paleomagnetic dipole has the same orientation as it does today.
Plate boundary
The border between two adjacent lithosphere plates