Fig. 1.1 shows the tropical rainforest belt reaching the highest annual precipitation values on the graph, peaking above 2000. Which climatic mechanism accounts for that rainfall total?
AYear round convection and convergence at the Inter Tropical Convergence Zone, driven by constant high insolation near the equator.
BOrographic uplift over a continuous equatorial mountain chain that forces every air mass to rise.
CRapid cooling of maritime air as it crosses a cold offshore current on its way towards the equator, which forces the moisture it carries to condense out as heavy rainfall over the coastal lowlands.
DProlonged frontal uplift where a warm air mass rides over a cold one along a stationary polar front.
Explanation
Near the equator insolation is high all year, so strong convection and year round convergence at the ITCZ deliver rain in every month with no dry season. Frontal uplift belongs to mid latitudes, orographic rain needs relief that the equatorial lowlands largely lack, and cold currents suppress rainfall rather than raise it.
Derived from ZIMSEC Advanced Level Geography 6037/1 Paper 1, June 2023 session, Q1