ACT - ADVANCE STUDY / NS (PHYSICAL SCIENCE)

http://eo.ucar.edu/basics/index.html

http://en.wikipedia.org/wiki/Intertropical_Convergence_Zone

http://www.weatherquestions.com/What_is_an_air_mass.htm

http://kidlat.pagasa.dost.gov.ph/genmet/pwf.html

http://en.wikipedia.org/wiki/Typhoons_in_the_Philippines