Ikogosi Warm Spring is described as a natural phenomenon because it

Ikogosi Warm Spring is described as a natural phenomenon because it occurs naturally. It is a natural tourist attraction located in Ekiti State, Nigeria, and is known for its unique features. The warm spring is formed by two distinct springs that meet at a confluence: a warm spring with a temperature of about 70 degrees Celsius and a cold spring with a temperature of about 37 degrees Celsius. The meeting point of these two springs creates a fascinating scenery where one can see steam rising from the warm spring while the cold spring flows freely. The warm temperature of the spring is due to the geothermal activity in the region, and the spring has been naturally occurring for centuries. Therefore, the correct answer is the option "occurs naturally".