The goal of Unit 11 of The Physics Classroom Tutorial is to develop an understanding of the nature, properties, behavior, and mathematics of sound and to apply this understanding to the analysis of music and musical instruments.
It's as big as the continental United States, but covered in sand. If you like to dig your feet in the sand, then the Sahara Desert is the place for you. Watch out though - it's hot! Temperatures range from 122 F to below freezing in the winter. Sand dunes can reach over 189 meters tall or be flat for miles and miles.
Residents of Ain Sefra in northern Algeria encountered snow in the hottest desert in the world on Jan 7. (Reuters) While the eastern United States was hunkering down in an exceptionally cold Arctic blast this past weekend, another part of the world, much less familiar with winter, braced for similar weather on Sunday â the Sahara Desert.