Hi, Im having difficulty with these Geology questions below. Could someone...

[myer84myer84]

...please help? 4. When rocks exhibit the same magnetic polarity as the present magnetic field, they are said to possess a)_________ polarity, but when they exhibit a polarity that is opposite to the present magnetic field they are said to possess b)_________ polarity.

7. The region where an oceanic plate descends into the asthenosphere because of plate convergence is called a/an a)__________. The process begins when the oceanic plate bends downward to produce a deep linear trough called a/an b)___________ on the seafloor.
8. Mountains (e.g., Andes Mountains) produced by volcanic activity associated with the subduction and melting of seafloor rocks are called a)__________. A chain of small volcanic islands formed in such a manner is called b)___________.

10. A weak zone of partially molten rock that is located about 100-350 km within the Earth is called the a)_________ while the brittle zone above it is called the b)_________.
11. ________ is a portion of the continent that has been st