The feature that provides evidence that a volcano existed in the past is calderas.
The feature that provides evidence that a volcano existed in the past is calderas. Calderas are large volcanic craters that form when a volcano collapses after a significant eruption or when the magma chamber beneath the volcano empties. These circular depressions can often be seen even after the volcano itself has eroded away over time. By studying the presence of calderas, geologists can determine the history and location of past volcanic activity. So, in this case, the correct answer is calderas.
