Final answer:
The Columbine High School massacre was not planned almost two years in advance.
Step-by-step explanation:
The statement 'Columbine was planned almost two years in advance' is false.
The Columbine High School massacre, which occurred in Colorado in 1999, was not planned two years in advance. The shooting was carried out by two students, Eric Harris and Dylan Klebold, who had been planning the attack for several months, not years.
The planning involved acquiring weapons and creating homemade explosive devices. The attack was carried out on April 20, 1999, and tragically resulted in the deaths of 12 students, a teacher, and the perpetrators themselves.