(Q020) Identify the true statement. a. All polarity chrons are the same length of time; they differ only in the magnetic strengths they represent. b. The width of each rock stripe is a measure of how long the polar direction took to change. c. The series of rock stripes perpendicular to and bilaterally symmetric across the mid-ocean ridge records the sequence of the Earth's magnetic reversals over time. d. Positive magnetic anomalies occur over areas of seafloor when the poles of the Earth's magnetic field and the paleopoles preserved in the seafloor basalt agree.

  it can seem a little confusing but if you read the entire chapter you will see that paul is refuting the idea that faith is based in works and that it is not the law or adherence to the law which saves give abraham as an example, showing that abraham had the faith to serve and follow god before the law of circumsision was instated and that what god is after from us is our faith in him and our willingness to follow him, which will eventually lead us to also being obedient to that faith comes first.  it is basically another way of saying that we are saved by faith, not by our works