1) The national animal of Canada is the beaver.

2) The Earth's core is hotter than the surface of the Sun.

3) The word "pizza" contains two vowels: I and A.

4) The Nile River, spanning approximately 6,650 kilometers (4,130 miles), is the longest river in the world. It flows through eleven countries in northeastern Africa, supporting various civilizations throughout history and serving as a vital source of water and transportation.