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.
A blanket of snow fell in the Sahara Desert on Sunday, delighting locals. It marks just the fourth time the weather phenomenon has occurred in the area in 37 years. The town of Ain Sefra in Algeria is known as the gateway to the Saharaâthe hottest desert in the world. A rare bout of icy weather brought the powdered snow but the sight didn't last long, as rising temperatures melted the snow during the day.