how do you know what the plates are doing? what features are present? pick 3 group of answer choices volcanic activity. a nearly straight line of extinct volcanic islands with only one island at the end of the chain that has an active volcano. an arc of volcanic islands where most of the islands have active volcanos. an arc of active volcanic mountains on the edge of a continent. a belt of mountains with few if any active volcanos. a ridge deep beneath the surface of the ocean in the middle of the ocean. a deep ocean trench. deep earthquakes that can be very strong. shallow earthquakes that can be very strong. shallow earthquakes that are nearly always weak. rift valley.