Answer:
A. Pacific ring of fire, b. Indonesian boundary, 3. Eastern coast of North america.
Step-by-step explanation:
- Pacific ring of fire is place located on the pacific plate being a major zone of earthquakes and volcanic eruptions and spans over a 40,000 kilometers area\ have a continuous series of volcano arcs, trenches, and belts.
- This belt has more than 500 volcanoes and consists of 81% of tectonic activity especially subduction zones.
- Also, the volcanoes of the Indonesian plates are amongst the most active in the world. Formed from the same process and comprising of Eurasian, indo- Australian and pacific plates.
- These volcanoes are home to supervolcano eruptions and have a scale of 5 on the volcanic eruption index.
- The US has an active transform boundary which is marked for shallowest earthquakes and comprises nearly 20 major volcanic eruptions along this boundary. The eruption of 1980 of st. Helens is marked as the most severe type with earthquakes such as the magnitude of 9 on the index.