Key ideas from Natalie Starkey

• Most volcanoes in the solar system are ice volcanoes (cryovolcanoes) found beyond the asteroid belt, more common than rocky ones - Natalie
• Olympus Mons on Mars is three times higher than Mount Everest because Mars lacks plate tectonics and has weaker gravity
• Venus likely has active volcanoes today but its thick carbon dioxide atmosphere makes surface observation extremely difficult
• Enceladus shoots ice particles from its subsurface ocean so high they form Saturn's E-ring, containing organic molecules suggesting potential for life
• Iceland generates all its electricity from geothermal energy by tapping volcanic heat just below the crust
• Io is the most volcanically active object in the solar system, erupting almost continuously with every space mission observing active plumes
• Earth's magnetic field depends on its molten iron outer core; Mars lost its magnetic field when its core solidified