L4 + L5 Vocab Exam 1 Flashcards

1
Q

Accretionary Prism

A

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.

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2
Q

Apparent Polar wander path

A

A path on the globe along which a magnetic pole appears to hve wandered over time.

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3
Q

Curie Point

A

The temperature at which rocks and minerals lose their permanent magnetisation.

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4
Q

Collison

A

The process of two buoyant pieces of the lithosphere coverging and squashing together.

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5
Q

Contential Rift

A

A liner belt along which contential lithospher streches and pulls apart.

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6
Q

Convection

A

Heat transfer that results when warmer, less dense material rises while cooler, denser material sinks.

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7
Q

Convergent Boundary

A

A surface across which two plates move towards each other so that one plate sinks beneath the other.

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8
Q

Dipole

A

A magnetic feild with a north and south pole like that of a bar magnet.

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9
Q

Magnetic Feild

A

The region affected by the force emanating form a magnet

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10
Q

Magnetic inclination

A

The angle between a magnetic needle free to pivot on a horizontal axis and a horizontal plane parallel to the Earth’s surface

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11
Q

magnetic declination

A

The angle between the direction a compass needle points at a given location and the direction of true north.

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12
Q

Paleomagnetism

A

The record of ancient magnetism pressured in rock

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13
Q

Marine magnetic anomalies

A

Variation of strength of Earths magnetic Field caused by magnetism in rocks of the ocean floor.

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14
Q

Normal polarity

A

Polarity in which the paleomagnetic dipole has the same orientation as it does today.

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15
Q

Plate boundary

A

The border between two adjacent lithosphere plates

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16
Q

Reversed polarity

A

Polarity in which the Paleomagnetic dipoles are opposite.

17
Q

Remanent magnetism

A

Magnetization left behind in a ferromagnetic material after an external magnetic field is removed.

18
Q

Accretionary prism

A

A wedge shaped mass of sediment and rock scraped off the top of an ongoing plate and accreted onto the overriding plate at a convergent plate margin.

19
Q

Collision

A

The process of two buoyant pieces of the lithosphere, converging and squishing together

20
Q

Continental rift

A

A linear belt along which continental lithosphere stretches and pulls apart

21
Q

Convection

A

Heat transfer that results when warmer less dense material, rises, while cooler denser material sinks.

22
Q

Convergent boundary

A

A surface across which two plates move toward each other, so that one plate sinks beneath the other.

23
Q

Divergent boundary

A

A boundary at which two lithosphere plates move apart from each other.

24
Q

Downwelling

A

The downward movement of a volume of moving material.

25
Q

Hotspot

A

A location at the base of the lithosphere, where temperatures can cause melting and igneous activity.

26
Q

Orogenic belt

A

A linear range of mountains

27
Q

Mantle plume

A

A column of very hot rock that rises up through the mantle

28
Q

Ridge push force

A

A process in which gravity causes the elevated lithosphere at a mid ocean ridge axis to push on the lithosphere.

29
Q

Slab pull force

A

The force that down going plates apply to oceanic lithosphere at a convergent margin.

30
Q

Suture

A

The contact defining the boundary of what were two separate crustal blocks prior to collision.

31
Q

Transform boundary

A

A boundary at which one lithosphere plates slips laterally past another.

32
Q

Triple Junction

A

A point where three lithosphere plate boundaries intersect.

33
Q

Upwelling

A

The upward flow of air or water 

34
Q

Wadati-Benioff Zone

A

A sloping band of seismicity defined by intermediate and deep focus earthquakes that occur in the downgoing slab of a convergent plate boundary.