Transcription: What are the similarities? Well, there are volcanoes on Mars, like those we know on Earth. One of the principal characteristics of Mars is these volcanoes, giant volcanoes. Mars has four of these giants. We know quite a lot about them. Their shape, closely related to the Earth, that of terrestrial volcanoes, but their dimensions are colossal, reaching a height of 26 or 27 kilometers and having on the average a base diameter of 500 to 600 kilometers. This is truly phenomenal, totally unlike anything we know on Earth. That's the first morphological characteristic that I'd like to emphasize. The ...
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