Exodus 9:29
כט) וַיֹּאמֶר אֵלָיו מֹשֶׁה כְּצֵאתִי אֶת הָעִיר אֶפְרֹשׂ אֶת כַּפַּי אֶל ה' הַקֹּלוֹת יֶחְדָּלוּן וְהַבָּרָד לֹא יִהְיֶה עוֹד לְמַעַן תֵּדַע כִּי לַה' הָאָרֶץ:
And Moses said to him [Pharaoh], "When I leave the city, I will spread my hands to Adonai. The thunder will cease, and there will be no more hail, in order that you know that the land is Adonai's. [Translation by Judaica Press, edited for gender neutrality]

Suggested Discussion Questions:

1. How did Moses' ability to stop the thunder and hail demonstrate that the land was God's?

2. Why do you think it was important that the plagues include natural disasters?

Time Period: Biblical (early ancestors to 165 BCE)