Volcanoes

Chapter 7 VOLCANOES Sect. 1 & 2

Volcanism ,[object Object],[object Object],[object Object],[object Object]

Major Volcanic zones ,[object Object],1. Subduction Zones 2. Mid-Ocean Ridges 3. Hot Spots

Subduction Zones ,[object Object],[object Object]

Mid-Ocean Ridges ,[object Object],[object Object],[object Object],[object Object]

Hot Spots ,[object Object],[object Object],Hawaiian Islands Galapagos Islands

Volcanic Eruptions Windows to Earth’s Interior Ability to see firsthand materials from mantle

3 General Types of Lava ,[object Object],[object Object],[object Object],[object Object],[object Object]

Kinds of Eruptions ,[object Object],[object Object]

Kinds of Eruptions ,[object Object]

Volcanic Rock Fragments ,[object Object],< 2 mm = volcanic ash < .25 mm = volcanic dust < 64 mm = lapilli (lil’ stones)

Three types of Volcanoes ,[object Object]

Crater vs. Caldera ,[object Object],[object Object]

Predicting Volcanoes ,[object Object],[object Object],[object Object],[object Object]

Extraterrestrial Volcanism Many planets & moons in the solar system were and are volcanically active

Extraterrestrial Volcanism The Moon Covered by Basaltic flows; no longer active; however, no evidence of plate tectonic activity

Extraterrestrial Volcanism Mars Numrous volcanoes & features; biggest one is shield volcano called Olympus Mons

Extraterrestrial Volcanism IO Moon on Jupiter; shows 9 active volcanoes erupting on Io

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