Final answer:
Multiple Torah scrolls are opened on Simchat Torah to celebrate the completion of the annual cycle of reading the Torah.
Step-by-step explanation:
On Simchat Torah, multiple Torah scrolls are opened in synagogues. The reason for this is to celebrate the completion of the annual cycle of reading the Torah.
During the holiday, the final portion of Deuteronomy is read, followed immediately by the opening of the first portion of Genesis. This is done to symbolize the continuous cycle of studying and learning from the Torah.