Enter your Name:   Enter your E-mail Address:  01. Define the following terms: a. Sedimentary rock b. Plastic rock c. Fault d. Epicenter 02. Label the sections (a-d) of the earth shown in the figure: 03. What have scientists observed in order to learn about earth's interior? 04. In the figure from problem #2, what two letters is the Moho between? 05. What causes the earth's magnetic field? 06. What two theories attempt to explain the earth's magnetic field? Which theory is the most scientifically valid? 07. What benefit do we derive from the earth’s magnetic field? 08.In a survey of the deep ocean, sonar measurements detect a deep trench on the bottom that runs as far as the instruments detect. What is the most likely cause of the trench? 09. The earthquake activity of two regions on earth is measured. The first region sits near the middle of one of the plates in the earth’s crust, while the other is very near a boundary between two plates. Which will (most likely) have the greatest earthquake activity? 10. Many powerful earthquakes are followed later by less-powerful earthquakes called "aftershocks." If an earthquake measures 6 on the Richter scale and is followed by an aftershock that measures 4, how many times more energy was released in the original earthquake as compared to the aftershock? 11. If a region of the earth has a lot of volcanic activity, what kinds of mountains do you expect to find there? 12. If a region of the earth is on the boundary between two plates, what kind of mountains do you expect to find there?