Why Was It Difficult for Spanish and Portuguese Mariners to Return

question 2

Multiple Choice

Why was it difficult for Spanish and Portuguese mariners to return home from the Canary Islands?

• A) They had to sail against the winds.
• B) Unusual magnetic fields in that area rendered navigational instruments useless.
• C) Berber pirates preyed on ships sailing northward from the Canaries.
• D) They had no knowledge of the tacking maneuver.

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