Exploring the Diversity of Volcanic Lava Types

Approximately how many active volcanoes are there around the planet?

• 1500

• 2000

• 1300

• 1000

What does the x-axis represent in the TAS diagram?

• Amount of feldspar

• Amount of olivine

• Amount of silica

• Amount of alkali compounds

Which type of lava is most commonly found at shield volcanoes like Kilauea in Hawaii?

• Andesite

• Basalt

• Dacite

• Rhyolite

What is the primary difference between basanite and tephrite?

• Eruption type

• Color

• Amount of olivine

• Viscosity

Which type of lava is associated with stratovolcanoes like Mount Rainier?

• Trachyte

• Andesite

• Phonolite

• Basalt

What color is dacite typically?

• Tan to red

• Orange-pink

• Gray to white

• Dark black

Which type of lava often appears alongside obsidian?

• Basalt

• Andesite

• Rhyolite

• Trachyte

What is the main difference between trachyte and trachydacite?

• Eruption type

• Viscosity

• Color

• Amount of quartz

Which type of lava is common in areas associated with rift zones or low-intensity hotspots?

• Basalt

• Andesite

• Phonolite

• Dacite

What is the color of phonotephrite lava?

• Gray to white

• Tan to red

• Light gray

• Medium to dark gray

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