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).
A capella group Pentatonix performed without a bass voice, after Avi Kaplan opted to leave the group. In a heartfelt video, he bid adieu to his fans and explained why he chose to depart. Find out who replaced Avi Kaplan and more about the mesmerizing singer, right here. Avi Kaplan was an integral part of a capella group, Pentatonix.