1) Mountains are formed through various geological processes, including tectonic plate movements, volcanic activity, and erosion.

2) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.

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

4) The sport of golf originated in Scotland and is played on courses with 18 holes, each with a designated par score.