Why do passive margins have no trenches? A. Trenches are caused by submarine canyons. B. Trenches are caused by plate movement. C. A continental break prevents trench formation. D. Trenches are filled with basalt.

## Step 1<br />Passive margins are areas of the ocean floor that are not near plate boundaries. They are characterized by a lack of significant tectonic activity, such as earthquakes or volcanic activity. This is because they are not located near plate boundaries where such activities typically occur.<br /><br />## Step 2<br />Trenches, on the other hand, are typically formed at convergent plate boundaries. This is where one tectonic plate is forced under another, creating a deep trench.<br /><br />## Step 3<br />Since passive margins are not near plate boundaries, they do not have trenches. This is because there is no plate movement to create trenches.