In "Volcano Alert!" (pp. 10-13), you read about Iceland, one of the most volcanically active places in the world. The chart below shows characteristics and examples of three common volcano types: shield, composite, and cinder cone. Study the chart, then answer the questions that follow.
1. Which type of volcano has the smallest width?
2. What is the difference between the eruptions of composite and cinder cone volcanoes?
3. Which volcano example in the chart is located on a planet other than Earth?
4. Viscosity is how resistant a liquid is to flowing. Which type of volcano in the chart has the least viscous lava? Which details in the chart gave you your answer?
5. Which volcano is more likely to put people at risk of breathing in ash: Mount Fuji or Mauna Loa? Why?
1. cinder cone 2. Lava from a composite volcano flows slowly down the sides. Lava from a cinder cone volcano shoots high in the air. Composite volcanoes have more violent eruptions.
3. Olympus Mons (Mars)
4. Shield volcano. Its lava is thin and watery, so it is less viscous.
5. Mount Fuji. It spews ash high in the air.
Common Volcano Types SHIELD COMPOSITE Shape Description broad and very tall with steep dome-shaped; up to sides; about 1-10 km 200 km (125 mi) wide (0.6-6 mi) wide Lava thin and watery thick and sticky Typical relatively quiet and explosive and Eruption gentle; lava travels violent; lava flows far from the opening slowly down the before cooling sides as ash shoots high in the air Examples Mauna Loa (Hawaii) Mount Fuji (japan) Olympus Mons (Mars) Mount Hood (Oregon) La Cumbre Mount Etna (Italy) (Galapagos Islands) CINDER CONE Shape Description short with steep sides; often less than 1 km (0.6 mi) wide Lava thick and sticky Typical explosive but small; Eruption lava is thrown high in the air, breaks into fragments and falls Examples Paricutin (Mexico) Crater Lake (Oregon) Sunset Crater (Arizona)