Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

15 Cards in this Set

  • Front
  • Back
Smallest volcano type; has very steep sides
Cinder cone shape and size
Example: Izalco, El Salvador
Example of Cinder cone
Low viscosity, very little gas, 52% or less silica
Basaltic magma composition
Quiet eruptions (lava flow)
Basaltic magma eruption
Due to rocks in upper mantle
Basaltic magma formation
High viscosity, high gas, 66% or higher silica content
Rhyolitic magma compostion
Extremely explosive eruptions with lots of ash
Rhyolitic magma eruption
Mix with silica/water rich continemtal crust
Rhyolitic magma formation
Medium gas levels, 52%-66% silica content
Andesitic magma compostion
Explosive to intermediate eruptions
Andesitic magma eruption
Forms from ocean crust melting
Andesitic magma formation
Hot molten rock that is magma once outside of the volcano; cools to form igneous rock
Found inside the volcano, in the asthenosphere, crust/lithosphere; Hot molten rock plastic or gummy look
Forms pumice, obsedion, basalt, scoria; outside of volcano
Extrusive igneous rock
Forms granite, gabbro, andesite; inside of the volcano
Intrusive igneous rock