In most places where people live, the biggest changes to the landscape in the past 500 years are due to: A. human activity. B. global warming. C. past ice ages. D. plate movement.

## Step 1<br />The question is asking about the biggest changes to the landscape in the past 500 years. The options provided are human activity, global warming, past ice ages, and plate movement.<br /><br />## Step 2<br />Human activity has had a significant impact on the landscape over the past 500 years. This includes the construction of buildings, roads, and other infrastructure, as well as the clearing of forests and other natural habitats.<br /><br />## Step 3<br />While global warming, past ice ages, and plate movement have also had impacts on the landscape, these changes typically occur over much longer periods of time than 500 years.<br /><br />## Step 4<br />Therefore, the biggest changes to the landscape in the past 500 years are most likely due to human activity.