The Equatorial Low-Pressure Belt, often called the Intertropical Convergence Zone (ITCZ), generally extends from the equator to about 10° North and 10° South latitude. Within this zone, intense heat causes air to expand and rise vertically, creating a consistent belt of low pressure characterized by heavy rainfall and lush tropical vegetation. (Equatorial low-pressure belt is a broad zone extending up to about 10° on both sides of the Equator; 5° represents only its central core.) ANSWER: (D) 10°