How did the FAA find out that flight 93 was hijacked?

A minute later, the transponder was turned off, but the Cleveland controller continued to monitor the flight on primary radar. The Herndon Center relayed information on Flight 93 to FAA headquarters. Joseph DeLuca called his father at 09:43:03 from row 26 to inform him the flight had been hijacked.

Explanation:

A minute later, the transponder was turned off, but the Cleveland controller continued to monitor the flight on primary radar. The Herndon Center relayed information on Flight 93 to FAA headquarters. Joseph DeLuca called his father at 09:43:03 from row 26 to inform him the flight had been hijacked.

Explanation:

b.letter b

explanation:

early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.