Because the eastern United States is now a passive margin the __ are now eroding away. a Appalachians b Cascades c Himalayas d Coastal Ranges

## Step 1<br />The question is asking about the geographical features that are eroding away in the eastern United States due to it being a passive margin. A passive margin is a region where the transition from land to deep sea is gradual and there is no significant tectonic activity. This means that the landforms in these areas are not being uplifted or folded by tectonic forces, but are instead being eroded by weathering and erosion.<br /><br />## Step 2<br />The options provided are the Appalachians, Cascades, Himalayas, and Coastal Ranges. The Cascades and Himalayas are not located in the eastern United States, so they can be eliminated from the options.<br /><br />## Step 3<br />The Coastal Ranges are located in the western United States, not the eastern United States. Therefore, they are not the correct answer.<br /><br />## Step 4<br />The Appalachians are a mountain range located in the eastern United States. They are part of the Appalachian Mountains, which stretch from Alabama in the United States to Newfoundland in Canada. The Appalachians are eroding away due to the lack of tectonic activity in the region.