Travis notes that his prediction is significantly lower than his calculated velocity. which error explains this difference? a) he forgot to account for friction. b) he forgot to zero the balance and found a weight for the marble that was too low. c) he weighed the marble in a weighing dish and failed to account for the mass of the weighing dish. d) he didn't position the photogate correctly and got the time required for the top of the marble to pass through, rather than to the middle.

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