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What is the average salt content of open ocean water?

The heat necessary to change the state of water between solid and liquid is known as  – 

What condition best describes transform boundaries of tectonic plates?

What is the study of ancient magnetism recorded in rocks that includes study of changes in location of Earth’s magnetic poles through time and reversals in Earth’s magnetic field?

Which of the following is used to measure the attenuation of light in the water?

Which of the following statement is not correct related to mid-ocean ridge?

A team of geologists is studying a coastal region where the following observations have been made: Frequent earthquakes occur offshore. A deep ocean trench lies several miles from the coastline. Nearby mountains are gradually increasing in elevation. Volcanic activity occurs inland. Which hypothesis best explains all of the observations?  

There are two kinds of body waves: P-wave and S-wave. Which of the statements is not correct related to body waves?

Based on isotope studies of rocks, what is the approximate age of Planet Earth?

Which of the following statements correctly describes the normal tonicity conditions for typical animal cells?