Exam 2: The Way the Earth Works: Plate Tectonics

In a hot-spot volcanic island chain,such as the Hawaiian Islands,all islands possess active volcanoes simultaneously and therefore the risks of volcanic hazards are about the same for all islands.

Spreading rates along mid-ocean ridges have ____________.

If you were using both a compass and a map marked with latitude and longitude to navigate,you might note the angle difference between your compass and what is marked on the map,called _____________.

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

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

All portions of the mid-ocean ridge system have a well-defined axial trough (central rift).

At a subduction zone,the overriding plate ____________.

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

The deep-ocean floor is flat and nearly featureless.

According to the figure below,every plate boundary can be recognized by ____________.

Evidence for a united Pangaea comes from the fossil record of which type(s)of organisms?

Tectonic plates might consist of ____________.

Consult the figure below.Most of the pulling force driving plate motion is produced ____________.

Hot spots are caused by ____________.

Deformed (bent,stretched,or cracked)lithosphere occurs ____________.

Hot spots can occur ____________.

Marine magnetic anomaly belts run parallel to ____________.

Where Earth's magnetic dipole intersects with the surface of the planet is called the ___________.

If mid-ocean spreading was to stop,but subduction continue,which of the following would occur?

Without paleomagnetism,_______________ .