To solve this problem, we need to determine how frequently Earth's magnetic poles reverse. Based on well-documented geological evidence and scientific research, Earth's magnetic poles reverse at predictable intervals.
Here's the step-by-step reasoning:
1. The frequency of Earth's magnetic pole reversal has been studied through the examination of geological records, such as the magnetization of volcanic rocks and sedimentary deposits.
2. These studies have shown a pattern of pole reversals happening at relatively regular intervals.
3. To answer the question, we'll compare the given options to the established scientific understanding of these intervals.
Let's take a look at each option:
- A. 250,000 years: This interval is too short. Significant evidence suggests that pole reversals do not happen this frequently.
- B. 22 years: This is far too short and does not align with geological data.
- C. 10 million years: This is consistent with scientific findings. The reversal rate of Earth's magnetic poles is approximately every 10 million years.
- D. billion years: This interval is too long and inconsistent with the frequency of pole reversals observed in geological records.
Based on our understanding of Earth's geological history and patterns of magnetic pole reversals, the most accurate and scientifically supported answer is:
C. 10 million years
Therefore, Earth's magnetic poles reverse approximately every 10 million years.
