How many different races are on earth?

Answer 1

In anthropology their are three major races, Caucasoid, Negroids and Mongoloids. All three have different skull types and differences in some bone structure. Each of the three major races there are variety of smaller groups who have some of their own individual characteristics for example Caucasians - there is Nordic, Alpine and Mediterranean.

In Genetics/most biologist basically say there is one race that is Homo-Sapiens, or may be define as species and race is ethnic ancestry, which in that case there are thousands.

Answer 2

The Torah speaks of three branches of post-Flood mankind: Yefet (Jafeth), Ham, and Shem (the three sons of Noah; Genesis ch.10).
The children of Yefet are (broadly speaking) the Europeans (Caucasians).
The children of Ham include the ancient Egyptians, Canaanites, Nubians, Bantu (and sub-Saharan Africans in general), and many others.
The children of Shem include the ancient Assyrians, Elamites, Arameans, Lyddians, and other Semitic peoples. One group of Semites gave rise to the Arabs, Hebrews, Moabites, Ammonites, Edumeans and others.

Answer 3

There is one human race, but there are many ethnic groups with unique cultural characteristics and physical traits. The concept of race is a social construct, not a biological one.