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.
Its categories are based on the annual and monthly averages of temperature and precipitation. The KÃ¶ppen system recognizes five major climatic types; each type is designated by a capital letter. A - Tropical Moist Climates: all months have average temperatures above 18Â° Celsius. B - Dry Climates: with deficient precipitation during most of the year. C - Moist Mid-latitude Climates with Mild Winters. D - Moist Mid-Latitude Climates with Cold Winters. E - Polar Climates: with extremely cold winters and summers. Tropical Moist Climates (A) Tropical moist climates extend northward and southward from the equator to about 15 to 25Â° of latitude. In these climates all months have average temperatures greater than 18Â° Celsius. Annual precipitation is greater than 1500 mm. Three minor KÃ¶ppen climate types exist in the A group, and their designation is based on seasonal distribution of rainfall.