Venn Diagram: Mount St. Helens and Nyiragongo ComparedUse the Venn diagram provided here t...

Venn Diagram: Mount St. Helens and Nyiragongo Compared

Use the Venn diagram provided here to compare and contrast the eruptions of Nyiragongo and Mount St. Helens. Write the numbers corresponding to features unique to either group in the larger areas of the left and right circles; note features they share in the overlap area in the center of the image.

1. Located near a convergent plate boundary.

2. Located near an early-stage divergent plate boundary.

3. Produced significant lava flows.

4. Eruption followed a century of inactivity.

5. Several eruptions in the last century.

6. Few monitoring instruments prior to unrest.

7. Volcanic gases released prior to main eruption.

8. Frequent earthquakes associated with unrest.

9. Unrest lasted for approximately 2 months before eruption.

10. Eruption occurred in daylight.

11. Volcano located within 20 kilometers (12 miles) of large city.

12. Volcanic activity subsided after about 1 week.

13. Low-viscosity magma.

14. USGS geologists aided in interpretation of volcanic activity.

15. Death toll less than 100.

16. Death toll more than 100.

17. Shape of volcano changed prior to eruption.

18. Eruption characterized by a massive lateral blast.