Name and describe the three types of major volcanoes (exclude lava domes and continental calderas). Identify their rock composition, shape, and the viscosity and composition of the magma that created them

What will be an ideal response?


ANSWER: A correct answer must include all of the following:
- Shield volcanoes are composed of basalt. They have gently sloping sides and formed from low-viscosity magma.
- Stratovolcanoes are composed of andesite. They have moderate slopes and formed from moderately viscous magma.
- Cinder cones are composed of rhyolite. The have steep slopes and formed from moderate-viscosity magma mixed with volatiles.

Environmental & Atmospheric Sciences

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