Exam 2: The Way the Earth Works: Plate Tectonics

At a transform plate boundary,two opposed plates ____________.

Every plate boundary can be recognized by ____________.

Late Paleozoic glacial deposits are NOT found in which of the following places?

The average thickness of continental lithosphere is about ____________.

The youngest sea floor occurs ____________.

Mid-ocean ridges are ____________.

Distinctive rock sequences on South America terminate at the Atlantic Ocean but reappear on the continent of ____________.

Regions of the sea floor with negative magnetic anomalies were formed during times when Earth's magnetic field ____________.

In the terminology of plate tectonics,an active margin is ____________.

Broad,sediment-covered continental shelves are found along ____________.

Marine magnetic anomaly belts are widest when and where ____________.

Marine magnetic anomaly belts run parallel to ____________.

When two bodies of continental lithosphere are pushed together at a convergent boundary,the result is ____________.

Segments of the mid-ocean ridge system are offset.Between the offset segments we observe ____________.

Beneath a blanket of sediments,oceanic crust is primarily composed of two rocks,____________.

The age of oceanic crust ____________ with increasing distance from a mid-ocean ridge.

At a subduction zone,the overriding plate ____________.

As compared to a slowly spreading mid-ocean ridge,a rapidly spreading ridge is ____________.

The magnetic field of Earth in the geologic past is ____________.

Most of the pulling force that drives plate motion is produced ____________.