What are some ways that humans fight erosion (check all that apply) Build on the edges of hills Build concrete barriers Dig holes Build fences Add drainage pipes

## Step 1
The problem is asking us to identify the methods humans use to combat erosion. Erosion is a natural process where the earth's surface is worn away by natural forces such as wind or water. Humans have developed various methods to prevent or slow down this process.

## Step 2
The first option, "Build on the edges of hills", is not a method to combat erosion. In fact, building on the edges of hills can increase the risk of erosion as it can disrupt the natural flow of water and wind.

## Step 3
The second option, "Build concrete barriers", is a method to combat erosion. Concrete barriers can act as a physical barrier to slow down the flow of water and wind, thereby reducing erosion.

## Step 4
The third option, "Dig holes", is not a method to combat erosion. In fact, digging holes can increase the risk of erosion as it can disrupt the natural flow of water and wind.

## Step 5
The fourth option, "Build fences", is a method to combat erosion. Fences can act as a physical barrier to slow down the flow of water and wind, thereby reducing erosion.

## Step 6
The fifth option, "Add drainage pipes", is a method to combat erosion. Drainage pipes can help to redirect the flow of water, thereby reducing erosion.