3. Practice Test -Seafloor Structures Currents &Tides The most prominent features of the ocean basins are the mid-ocean __ which average 1500m high Sediments Vents Ridges Shelves

## Step 1<br />The question is asking for the most prominent feature of the ocean basins. The options provided are Sediments, Vents, Ridges, and Shelves.<br />## Step 2<br />The question also provides additional information that these features average 1500m high. This information is crucial in identifying the correct answer.<br />## Step 3<br />Among the options, mid-ocean ridges are the most prominent features of the ocean basins. They are underwater mountain ranges that form where tectonic plates are moving apart, or spreading apart. This process is known as seafloor spreading.<br />## Step 4<br />Mid-ocean ridges are the highest features of the ocean floor, with some peaks rising over 1500 meters high. This matches the additional information provided in the question.