You see, we are more likely to find tropical rainforest and jungles on a hot and sunny location like on the equator. In fact, desert doesnt always have to be hot at all, for instance, the antarctica. Deserts are formed on locations with different climates and less precipitation. And unlike the locations on the equator, which receives high amount of rainfalls, deserts receive way too little, thus, affecting the vegetation and growth in the area.
All of these major cities are by the ocean for trade and are typically in between other small towns and cities, this provides tourism and attraction from other countries.
I'm order:
Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma