Atmospheric pressure is the force per unit area within Earth's atmosphere. Standard atmosphere (atm) equals 101,325 Pa or 14.696 psi. Pressure decreases with increasing altitude due to less overlying mass
Natural science describes and predicts natural phenomena through empirical evidence. Science uses formal tools like mathematics and logic to explain nature. Modern science succeeded classical approaches to natural philosophy
Air density (ρ) is mass per unit volume of Earth's atmosphere. At 101.325 kPa and 20°C, air density is approximately 1.204 kg/m³. Air density decreases with altitude and varies with temperature and humidity
Tri-State tornado (1925) is most extreme, reaching 219 miles and 3+1⁄2 hours. Guin tornado (1974) set highest violent tornado speed at 75 mph. Daulatpur-Saturia tornado (1989) killed approximately 1,300 people worldwide
Africa experiences a variety of climates including equatorial, tropical, and desert types. Temperate climates are rare, with high elevations and fringes having Mediterranean climates. Africa is the most tropical continent due to its equatorial location. Temperatures are consistently high, with the hottest region being Dallol, Ethiopia
November is the eleventh month of the year in both Julian and Gregorian calendars. It was the ninth month of Romulus' calendar c. 750 BC. Southern Hemisphere's equivalent is May, Northern Hemisphere's is November