Which observation would provide indirect evidence that supports a hypothesis that the bubbles are o2 ?
a. a decrease in the approximate size of each leaf on plants kept in darkness.
b. a description of the shape of each leaf after a plant is kept under dim light.
c. a count of the bubbles produced over time by one plant under bright light
d. an increase in bubbles on the plant when it is moved under a brighter light.

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