The “Ring of Fire” is a long chain of volcanoes that encircles the Pacific Ocean. Which of the following is the best explanation for the arrangement of these volcanoes? A) They follow the shape of the adjacent tectonic plates under the ocean.
B) One volcano usually triggers a second volcano with its hot magma.
C) Volcanoes always form in rings because of underwater convection currents.

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?