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

2) Male seahorses are the ones who give birth to their offspring.

3) The Brexit process, initiated by the United Kingdom's referendum in 2016, led to the country's withdrawal from the European Union in 2020, marking a significant political and economic change for both the UK and the EU.

4) The word "piano" contains three vowels: I, A, and O.