If the poreis completely closed to the surface, the result is a whitehead. If the pore is wide open, oil becomes oxidized (that is, acted on by oxygen in the air), the oil changes from white to black, and the result is a blackhead. This is how the two types of comedones develop. Comedo is the Latin word for glutton.
The Amazon rainforest topical climate. Tropical climate refers to zones in a range of latitudes between 5/10 to 35. The temperatures remain high all over the year and shows an annual wide change in precipitations with wet and dry seasons: The dry season duration is proportional to the latitude to ultimatly become a mostly dry area.
Worldwide zones of Tropical savanna climate (Aw/As). Tropical savanna climate or tropical wet and dry climate is a type of climate that corresponds to the KÃ¶ppen climate classification categories Aw and As. Tropical savanna climates have monthly mean temperatures above 18 Â°C in every month of the year and typically a pronounced dry season, with the driest month having precipitation less than 60 mm and also less than 100 â [total annual precipitation {mm}/25] of precipitation.â1 This latter fact is in direct contrast to a tropical ...