Mount saint helen is an active stratovolcano and it was formed due to the subduction of the Juan de fuca plate.
The three principles that describe how the economy as a whole works are: (1) a country's standard of living depends on its ability to produce goods and services; (2) prices rise when the government prints too much money; and (3) society faces a short-run tradeoff between inflation and unemployment.
Answer: 1. They shake the ground
2. They travel through solids
3. They vibrate from side to side
Explanation: Hope this helps!
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