1) The Serengeti National Park, located in Tanzania and extending into Kenya, is renowned for its vast savannahs, diverse wildlife, and the annual wildebeest migration. It is a UNESCO World Heritage site and a popular destination for safari enthusiasts and nature lovers.

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

3) The world's most expensive car is the Bugatti La Voiture Noire, which sold for over $18 million.

4) The concept of human rights advocates for the basic rights and freedoms to which all individuals are entitled, regardless of their nationality, ethnicity, religion, or other characteristics.