Some important essential oil guidelines to remember: Essential oils should be diluted in a carrier oil to a maximum of 5% (see these 5 Face Oils For Naturally Clear, Flawless Skin and The Best Face Oils By Skin Type). So since 1 ml is 20 drops, for every 1 ml of carrier oil, you would add 1 drop of EO.
The San Francisco Peaks are composed of six peaks, including the four highest in Arizona: Humphreys Peak, 12,637 feet (3,851 m), Agassiz Peak, 12,356 feet (3,766 m), Fremont Peak, 11,969 feet (3,648 m), Aubineau Peak, 11,838 feet (3,608 m), Rees Peak, 11,474 feet (3,497 m), and Doyle Peak, 11,460 feet (3,493 m).
It is also the tallest building in the state of Arizona. The second-tallest building in the city and the state is the US Bank Center, which rises 407 feet (124 m). Of the 20 tallest buildings in Arizona, 18 are located in Phoenix. The history of skyscrapers in Phoenix began with the completion in 1924 of the Luhrs Building, which is regarded as the first high-rise in the city; the structure rose 138 feet (42 m) and ten floors.