The geosphere is the subsystem that includes all parts of the solid surface of the Earth right down to, and including the interior of the Earth. This includes not only materials visible in the Earth’s surface like rocks and mountains, but also materials inside the Earth right to the very center of the planet.
The Seven Summits is a list that consists of the highest mountain on each of the Earth’s seven continents. Click on each mountain name in order to visit it. (Note that Australia is considered to be part of Oceania.)