1) The eye of a cyclone is a region of calm, relatively clear skies and light winds at the center of the storm.

2) The Great Barrier Reef in Australia is the largest coral reef system in the world and is visible from space.

3) Mount Kilimanjaro in Tanzania is the highest mountain in Africa and attracts climbers from around the world.

4) The term "cloud computing" refers to the delivery of computing services, including storage, databases, and software, over the internet rather than on a local server.