疑难:本句中that 引导的是定语从句吗? In 1996 scientists discovered organic compounds and minerals in a meteorite (陨石),consisting of Martian rock,that collided with Earth around 11,000 B.C. 本句中rock 后面的that 引导的是定语从句吗?先行词是哪个?如果引导的是定语从句,那应该是非限定性定语从句,可that是不能引导非限定性定语从句的?