Which of the following could best be compared to the story of the hero heracles' battle with the many-headed hydra?
a. henry ford's invention of the automobile assembly line.
b. the effects of the beatles on rock and roll music.
c. martin luther king's efforts to fight racism in the american south.
d. michael jordan's basketball career.

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