Genesis 12:10

10But a famine occurred in the land. And Abram descended to Egypt, to sojourn there. For famine prevailed over the land.
12:10People went to Egypt during a famine. For famines were often caused by droughts. Israel and the surrounding regions have little rain even in a year of average rainfall. When there is a drought, they cannot grow crops without rain. And many of their smaller rivers or streams would dry up completely during a drought. But even during a severe drought, the river Nile never went dry. So Egypt could always grow food.(Conte)
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