Dr. Hamilton will explore volcanic processes on Mars through a combination of satellite image analysis and comparisons with volcanoes in Iceland, Hawaii, and the Continental United States Results show that the most recent episodes of volcanic activity on Mars are dominated by enormous fissure-fed lava flows. Such events are rare within the modern geologic record on Earth, but comparable to older terrestrial "flood lava" eruptions that formed the Columbia River Basalt Group. The presentation will also consider physical processes that may explain similarities and differences between the styles of volcanism observed on the two planets.