Energy release associated with rapid movement on active faults is the cause of most earthquakes. A fault plane is the plane that represents the fracture surface of a fault. A fault trace or fault line is the intersection of a fault plane with the ground surface.
The average IQ of a teenager is 100. IQ tests take age into consideration, so the average score is always 100, regardless of a person's age.
So, short answer: Tweens are those kids who say that's who they are; and teens are tween graduates. Ages of tweens very generally vary from about age 8 to about age 16 in girls and boys, both. But like any bell curve, the examples of 8 and 16 year old Tweens are fewest.