ES Jan 10

Foliated rocks are characterized by:

• visible layers

• angular fragments

• high temperature

• small size

By studying the minerals of a metamorphic rock, one can deduce information about the conditions in which the rock formed. Which statement BEST explains this?

• Some minerals are produced spontaneously under certain temperatures and pressures.

• As pressure and temperature increase, existing minerals become unstable causing them to change which are stable in the new environment.

• Rocks exposed to the same conditions will have the same mineral composition

Contact metamorphism occurs at:

• Shallow depth, low pressure, high temperature

• Shallow depth, high pressure, low temperature

• Extreme depth, high pressure, high temperature

• Extreme depth, high pressure, low temperature

The continental drift theory was proposed by:

• Albert Einstein

• Alfred Einstein

• Alfred Wegener

• Albert Wegener

The process which oceanic plates go under continental plates, as illustrated in the figure, is:

• induction

• subduction

• deduction

• integration

An ocean has a mid-oceanic ridge at the eastern boundary and a trench at the western boundary. Which of the following statements are true about this ocean? The age of rocks is _____ from east to west and rocks get destroyed at the _____ boundary.

• increasing; eastern

• increasing; western

• decreasing; western

• decreasing; eastern

This process of magma generation occurs when extreme accumulated pressure is released at mid-oceanic ridges.

• Flux melting

• Decompression melting

• Mantle plume generation

• Igneous intrusion

Refer to the image here. Two plates (shown as brown slabs) are above the mantle with the illustrated convection current. Which plate boundary MOSTLY describes boundary X?

• Convergent plate boundary

• Divergent plate boundary

• Transform plate boundary

In the process of subduction, which plate goes under the other?

• The denser plate goes under

• The less dense plate goes under

• What goes under is random

A mantle plume is located below a tectonic plate, which moves in a single direction. Because of their interaction, a chain of volcanoes forms from right to left. From this information, what is the direction of motion of the tectonics plate?

• right to left

• left to right