 Other chief crops include coffee, bananas, and oil palms, which produce palm oil and kernels.Natural resources include petroleum, natural gas, diamonds, manganese, iron, cobalt, bauxite, copper, gold, nickel, tantalum, silica sand, clay, palm oil, and hydropower.Natural hazards include the heavy surf and the lack of natural harbors on the coast; during the rainy season torrential flooding is a danger.