Question

review the text. mid - ocean ridges are geologically important because they occur along divergent plate boundaries, where new ocean floor is created as earths tectonic plates spread apart. as the plates separate, some molten rock rises from the interior of earth to the seafloor, producing enormous volcanic eruptions of basalt and building the longest chain of volcanoes in the world. because most of these eruptions occur deep under the water, they often go unnoticed. the spreading rates of ridges vary. some spread quite slowly, no more than one to three centimeters per year, while others spread at rates approaching ten to twenty centimeters per year. the rate of spreading influences the topography, or physical features, of the ridge. a slowly spreading ridge has a where would a list of unanswered scientific questions about the mid - ocean ridge system fit best? the first paragraph the third paragraph the sixth paragraph

Explanation:

The first paragraph focuses on the geological importance and formation of mid - ocean ridges. The third paragraph is about the spreading rates of ridges. A list of unanswered scientific questions would be best placed after presenting the main information about the mid - ocean ridge system. Since only two paragraphs are shown and a sixth paragraph is mentioned as an option, it implies that more information about mid - ocean ridges would come after the third paragraph, making the sixth paragraph the most logical place for a list of unanswered questions.

Answer:

the sixth paragraph