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Anonymous

If Africa is the hottest continent in the world then why don’t all Africans have dark skin? ?

Some are light brown, some are medium brown and some are dark brown? Why? 

17 Answers

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  • ?
    Lv 4
    2 months ago

    The Earth is tilted on its axis, and [African] countries closest to the equator get the strongest UV rays from the sun. Humans who live in sunny harsh climates “close” to the equator evolved to have darker skin as protection from skin cancer. Meanwhile, humans who live in cloudy climates “far” from the equator evolved to have lighter skin so they could absorb more Vitamin D from the sun. Therefore, Africans who live close to the equator have the darkest skin while Africans farther from the equator have lighter skin. 

    Evolutionary changes take thousands of years. These variations in skin color are largely attributed to our prehistoric ancestors. In the last couple hundred years, a very short time on Earth, many Europeans and people from the Middle East moved to Africa. So keep in mind that immigrants won't instantly adapt to the climate; these new populations have to reproduce with dark-skinned Africans in order for their offspring to have darker skin 

  • Anonymous
    2 months ago

    The original races of people whom God placed on the earth would have all had skin tones to match the warmth of the place in which they were to be born.  Once people began to find ways of moving around on the earth God still left them with the colour of skin that they had been born with and with their reproducing ability to still have children who look like the parents - hence black people in lands which were, once occupied ONLY by paler people - and VICE VERSA.  Our genes are now established and only change if people intermarry with people having different skin colours and having different genes to pass on to the next generation/s.

  • Anonymous
    2 months ago

    Coastal northern Africa is Mediterranean like Greece and Italy and is cooled down by the Mediterranean Sea. The Saharan region is hot desert. Central Africa is hot, humid jungle and Savannah. South Africa is not as hot.

    Africa has different climates. That is why it has different races. South Africa was first inhabited by brown capoid people called Khoisan people until congloid groups invaded and took their territory over. Central Africa is inhabited by congloid people and dark caucasoid people. North Africa since written history has been inhabited by Caucasoid people.

    Of course, now that there's air condition and better traveling, Africa is becoming more mixed. You'll see black people in North Africa and white people in central and south Africa.

  • 2 months ago

    It isn't about heat but intensity of UV radiation.  Nor is Afrika the hottest continent.  The hottest place on Earth is in North America.  There is variation in skin tone in populations in Afrika, particularly among the San of the Kalahari among whom there is a high incidence of albinism, because there is generally more genetic variation between Afrikans south of the Sahara than the rest of the world.  The likes of the Tuareg, Bedouin and Berber have mixed with Western Asian and European populations and therefore have lighter skin tone.

  • Anonymous
    2 months ago

    All of Africa isn't hot. Most of it has a warm tropical climate. The hottest parts are near and at the equator and it's deserts

  • Anonymous
    2 months ago

    Optimal skin color is a compromise between getting sufficient Vitamin D production and avoiding skin cancer due to exposure to UV radiation from the Sun, and in the absence of dietary Vitamin D it is a function of latitude and average cloud cover (not temperature as such).  It is one of the most rapidly-evolving human traits, so that the mass migration of a population will result in a change in skin color to the new optimum within about 10,000 years.  Some human populations that have migrated in the past 10,000 years or so have not yet achieved the optimal skin color for their new environment.

    The northern parts of Africa are actually pretty far north, compared to North America.

    Given the ready availability of synthetic Vitamin D, the optimum skin color is dark, as dark as possible.

  • 2 months ago

    Those in the Northern parts of Africa are oliveskinned🫒, like Southern Europeans and the Middle Easterners, while most of Africa is indeed black.  UV rays causes darker skin not necessarily the hotter temperature though hotter places are by the equator which has more uv rays...

  • Anonymous
    2 months ago

    Early human ancestors started out with light skin according to biologists. Dark skin evolved after humans lost their body fur because naked skin was vulnerable to UV radiation as explained in the Out of Africa hypothesis.

  • Anonymous
    2 months ago

    Because heat doesn't determine skin color, you moron. 

  • 2 months ago

    Dark skin is a protection against UV radiation, not against heat.

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