This figure is a graph. The y-axis is labeled "reaction rate," while the x-axis is labeled "PH." The x-axis ranges from 0 to 14. The plot line is U-shaped, beginning approximately three quarters of the way up the y-axis and gradually dipping down to its low point at a PH of 6. The plot line then gradually rises again to its highest point at a PH of 12. It then dips back down to about three quarters of the way up the y-axis at a PH of 14. Image Courtesy of 3DScience. com The graph above shows the progress of an enzyme-catalyzed chemical reaction. Based on the graph, this enzyme is minimally active between pH 5-7 works optimally between pH 5-7 is minimally between pH 0-3 works optimally between pH 0-3

1. seamount a raised footwall block between normal fault creates this 2. syncline break between rocks where a hanging wall rises relative to a footwall 3. hot spring on rolling hills, this a dip between hills 4. volcanic neck created when a block with hanging walls slips down between normal faults 5. caldera underwater volcano that never reaches above sea level 6. horst natural hot water on earth's surface containing many minerals 7. graben underwater volcano whose top is eroded flat by waves 8. crater less than a mile in diameter; looks like a bowl at the top of a volcano 9. guyot magma that filled the central vent that remains after the volcano has eroded 10. reverse fault over 1 mile in diameter; looks like a bowl over a volcano