Igneous rocks are classified according to their texture and composition. Composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock (the two are obviously related). Texture refers to the size and arrangement of the minerals or grains that make up a rock.
Pentatonix (or PTX) is an American a cappella group consisting of five vocalists originating from Arlington, Texas.entatonix began with three friends who grew up together and were schoolmates at Martin High School in Arlington, Texas: Kirstin Kirstie Maldonado (born May 16, 1992), Mitch Grassi (born July 24, 1992), and Scott Hoying (born September 17, 1991).
Pentatonix. Pentatonix, a 5-member acapella group, began with three friends Kirstie Maldonado, Mitch Grassi, and Scott Hoying at Martin High School in Arlington, TX. Hearing of a local radio show hosting a competition to meet the cast of Glee, they arranged a trio version of âTelephoneâ and sent it in.