__________ have occurred on average every 500,000 years during the past 65 million years of Earth's history.

Question

Quizplus · Accepted Answer

Magnetic reversals, where the Earth's magnetic field flips polarity, have occurred on average every 500,000 years during the past 65 million years. This is known from studies of magnetic minerals in rocks on the ocean floor. The other options (A, B, and C) do not have a predictable occurrence rate or are not related to the Earth's magnetic field.

__________ Have Occurred on Average Every 500,000 Years During the Past