Here in Spain all of them are independent subjects at university and last year of high school, but in the first years of high school the contents related with physics and chemistry are joined in the same subject. The same happens with biology and geology. Therefore, high school physics teachers are usually chemists, and people teaching geology are often biologists. Maths are taught always as an independent subject. I have been told that in Russia they are grouped in a different way: physics with maths, chemistry with geology. How is the situation in USA and other countries?