The continent with no volcanoes is Australia. Unlike other continents, Australia is located on a tectonic plate that has been relatively stable for millions of years. This stability means that geological activity, such as volcanic eruptions, is extremely rare.
Most volcanoes are found at tectonic plate boundaries, where plates can move apart or collide, causing magma to rise and create volcanic activity. However, Australia sits at the center of the Indo-Australian Plate, far away from the edges where such activity is more common. While there are some ancient volcanic formations in Australia, these are not active volcanoes, which distinguishes Australia from other continents like North America, South America, and Africa that have numerous active volcanoes.