Use Map Viewer Classic to the right, or open it in a new browser window as you did in the first activity.

Click Modify Map above the map (top right) and zoom the map to show the 48 states, if not already there.

Click Add in the toolbar above the map and choose Browse Living Atlas Layers. In the left panel, search hydro and click on the name Esri Hydro Reference Overlay. A panel opens and shows information about that layer. Click Add to Map, close the info panel, and click Details on the toolbar above the map.

Zoom in on your region.

Click Add in the toolbar above the map and choose Search for Layers. Type popular demographics and find the US thumbnail with purple dots that is by esri_demographics. Click the + button to add it to the map.

Click Details in the toolbar above the map and click Content (middle button) at the top of the details panel. Some layers are grayed out! This means they won't display at the scale you are at. Uncheck the box beside each layer except ZipCode to turn them off. Zoom in/out until the ZipCode layer appears.

Click a Zip code, scroll the pop-up, and see the attributes. Each attribute can be the basis of a map. All the features have the same attributes.

In the Contents in the left panel, hover over or click the Zip Code layer. Click the colored shapes (Change Style). In 1: Choose an attribute to show scroll down to and select 2018 Median Household Income (Esri). Wait a moment and once the map changes, select Counts and Amounts (Color) and click Options.

Now you are going to change the divisions! Drag the upper divider to 80,000 (or click the number beside the divider and type it). Set the lower to 30,000. (Q: Does it change the look of the map? Does it change the values of people's income?)

Change the upper value to 100,000 and the lower to 50,000. (Q: Does it change the look of the map? Does it change the values of people's income? Remember that a map is a communication instrument designed according to what the mapmaker chooses.)

Still in the Change Style panel, at the bottom, click Cancel. Choose a different attribute 2018-2023 Population: Annual Growth Rate (Esri). Wait a moment and once the map changes, click Options in Counts and Amounts (Color). At the top of the panel, keep Divided by as None, but set Theme to Above and below. Click Symbols and choose green/white/red. (Colorblind? Choose a color ramp that works.) Set the divider numbers to 1.0, 0, and -1.0. [Anything with 1% annual growth has a doubling time of 70 years.]

At the bottom of the side panel, click OK then Done. You are back on the map and can explore what you've made. At the top of the Details panel, click Legend (right of Contents).

Zoom out until the Zip layer disappears. Frustrating? Let's change the layer's properties. At the top of the Details panel, click Contents (the middle button).

Hover over or click the Zip Code layer and click the three dots (ellipses). Click Set Visibility Range. Drag the left divider (upper limit) to Country (stop before Countries as zooming out too far with lots of high-resolution data slows the viewing experience). Notice the patterns as you explore the countryside.

Focus on the fastest-growing Zips by using a filter. ("Please, computer, only show me the features that meet the following condition...") Hover over the Zip layer and click Filter (right of Change Symbol). In the Filter window are three elements: the first is the attribute to filter, the second is the condition to use in the filter, and the third is the value. Set the attribute to 2018-2023 Population: Annual Growth Rate (Esri), set the condition to is greater than, and set the value to 1. Click Apply Filter. The areas left on the map are growing fast - they'll need more of everything!

Now let's get to the core of this example project - flooding! Add one more dataset Flood Factor risk statistics (v1.3). (Need a refresher on adding data to the map? Click Add on the toolbar above the map and select Search for Layers.) Look for the yellow-blue thumbnail and click on the layer name to see metadata (info about the data), click Add to map, and click Details on the toolbar above the map. Note the four scales and that you can adjust visibility and also transparency. Explore your region of interest, turning layers on and off to build a vision.