What is a gyre?
a. a circular-moving current system within an ocean basin
b. an upwelling along a coastline
c. a westerly moving current system within an ocean basin
d. a deep-ocean density current

The correct answer is option A.

Explanation:

Gyre: A circular or spiral motion or circular ocean currents formed on an ocean basin due to the action of the Earth's wind pattern and forces created due to the rotation of the Earth.

From the given the options the correct option which define the gyre correctly is: option A.

volts times amps 6 x 0.5 3w

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.