Exam 2: The Way the Earth Works: Plate Tectonics

The Wadati-Benioff zone extends down within the mantle to a maximum depth of ____________.

Subduction zones are ____________.

The apparent tendency of the north (or south)magnetic pole to vary in position over time is termed ____________.

Which plant genus dominated glaciated regions during the late Paleozoic and early Mesozoic?

Sea-floor spreading is driven by volcanic activity ____________.

All basalts younger than 700,000 years old ____________.

The primary difference between lithospheric and asthenospheric mantle that gives rise to numerous divergent patterns of physical behavior,is ____________.

Currently,most geologists ____________.

Continental lithosphere ____________.

At a convergent plate boundary,two opposed plates ____________.

A triple junction is a place on Earth's surface where ____________.

At a subduction zone,the downgoing (subducting)plate ____________.

Marine magnetic anomalies result from sea-floor spreading in conjunction with ____________.

At a divergent plate boundary,two opposed plates ____________.

Continental coastlines that occur within the interior of a tectonic plate are called ____________.

Wegener's idea of continental drift was rejected by American geologists because ___________.

Tectonic plates might consist of ____________.

Hawaii is an example of ____________.

Abundant swamps led to the formation of coal during the Late Paleozoic in which of the following places?

Under the theory of plate tectonics,the plates themselves are ____________.