Which is not true of the rickettsias?

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity

What is the problem in this article? what solution does the article propose?