"The heavens almost tear apart therefrom," meaning: they split apart because of it. "And the earth splits open, and the mountains collapse in destruction," meaning: falling down.
﴿يكَاد السَّمَوَات يتفطرن مِنْهُ﴾ أَيْ: يَتَشَقَّقْنَ مِنْهُ ﴿وَتَنْشَقُّ الأَرْضُ وتخر الْجبَال هدا﴾ أَي: سقوطا
