The Azores are volcanic in origin. Lava welling up between gaps in tectonic plates under the sea floor formed the islands between 7 million and 300 thousand years ago. This makes them similar to Hawaii in terrain, with lots of steep, eroded hills. The climate is also similar, rarely too hot or cold, giving lush vegetation, although with more variety than Hawaii has. The Azores are much smaller than Hawaii, with Sao Miguel being the largest island, only 30 miles long and 10 miles wide.