Casa Grande Ruins National Monument located in Arizona preserves Hohokam Culture and ruins of the largest prehistoric st ...

we are able to see that these two regions are evolving in very similar ways.' If the researchers are right, this means that the break-up of the European and North American continents is still ongoing.

Indigenous North Americans spread peaches after explorers introduced them. They developed unique varieties and cultivated ...

The strength of the sun's ultraviolet (UV) radiation is expressed as a Solar UV Index or Sun Index.The UV Index does not exceed 8 in the UK (8 is rare; 7 may occur on exceptional days, mostly in the ...