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

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

3) The European Union (EU) is a supranational organization comprising 27 member states that cooperate on various issues, including trade, economic integration, and common policies, while preserving individual national sovereignty.

4) A newborn kangaroo is about 1 inch (2.5 centimeters) long and weighs less than a gram.