Claire Chadwick; Lauren Maurizio; Robin Humphreys; and Vijay Vulava
Volcanoes and Igneous Rocks
Let’s recap what we have learned about volcanoes, volcano hazards, and igneous rocks.
Exercise 10 – Volcanoes and Igneous Rocks
- Based on the answers in the previous Parts, fill in the table below. Match the alphabet on the table with the igneous rock.
| Volcano Type | ||||
| Composite | Composite | Shield | ||
| Composition | ||||
| Felsic | Intermediate | Mafic | ||
| Texture | Cooling Rate | |||
| Fine-grained | Fast | A | E | G |
| Coarse-grained | Slow | B | F | H |
| Glassy | Fast | C | ||
| Vesicular | Slow | D | ||
- In the table above, the type of volcano that matches each rock composition is shown. Identify the rocks that could be found at composite volcanoes from the list.
- Identify the rocks that could be found at shield volcanoes from the list.
- Imagine you are a geologist studying a volcanic island that hasn’t erupted since it became inhabited around 300 years ago. You find rocks like andesite and pumice in the area. What does this tell you about the volcanic hazards that this volcano poses to the inhabitants and what should they prepare for during a potential future eruption?
