Shield Volcanoes

Definition:

Shield volcanoes are a type of volcano with broad, gently sloping sides and are composed primarily of basaltic lava flows. They are named for their broad, shield-like shape that resembles a warrior's shield.

Formation:

Shield volcanoes are formed by the eruption of low-viscosity basaltic lava, which travels long distances before solidifying. This results in the gradual buildup of broad, gently sloping layers of lava that give the volcano its characteristic shape.

Characteristics:

• Shape: Broad and low-profile with gentle slopes.
• Lava: Composed primarily of basaltic lava, which gives the volcano its low viscosity and ability to flow long distances.
• Eruptions: Typically non-explosive, with lava flows being the primary form of eruption.
• Size: Can be massive in size, covering large areas.
• Examples: Mauna Loa and Mauna Kea in Hawaii, and the Galápagos Islands are home to numerous shield volcanoes.

Study Guide:

If you're studying shield volcanoes, here are some key points to focus on:

1. Describe the shape and size of shield volcanoes.
2. Explain the composition of the lava that forms shield volcanoes.
3. Compare and contrast the eruptions of shield volcanoes with other types of volcanoes.
4. Provide examples of famous shield volcanoes and their locations.
5. Discuss the potential risks and benefits associated with living near shield volcanoes.

Conclusion:

Shield volcanoes are fascinating geological features with unique characteristics and formation processes. By understanding their composition, eruptions, and examples, you can gain a deeper appreciation for these natural wonders.