An important example of a "positive feedback loop" in the polar climate system is: a. Scientists in remote places check on each others instruments.

b. Warming ocean water opens new areas for marine species.

c. Warmer winters cause more plant growth, providing more food.

d. Sea ice melt opens more ocean to sunlight, causing more melt.

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