Nigeria is Africa's most populous nation. It is the largest oil producer and second largest economy in Africa.One of the official languages in Nigeria is English, although most Nigerians speak pidgin English which can be very difficult to understand for native English speakers. Remember that your English is as difficult to understand to them as theirs is to you. Nigeria's climate varies. It is equatorial in the south, tropical in the center, arid in the north. Natural hazards include periodic droughts and flooding.