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Carlisle
When a river freezes over, the water in the middle is sometimes still running.
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Bondurant
The corn appears to be ready for harvest due to the amount of water and sun it has received.
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Polk City
Crescent-shaped shadows can be seen during a 2017 eclipse.
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Northeast
The Driftless Area is a region in northeastern Iowa as well as other parts of the Midwest where the last continental glaciers passed by, leaving this area driftless.
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West Des Moines
Clouds are made up of trillions of water droplets and are an essential component of the water cycle.
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Sioux Center
Weathering and erosion impact natural and human-made objects alike.
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Waverly
Water towers can be found in almost every town and city in Iowa, but their purpose involves much more than simply storing water.
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Woodward
When the seasons change, animals have ways to adapt to the different temperatures and weather.
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Sioux City
The visible colors of sunsets are the result of many different natural and human-made factors.
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Algona
This Iowa-grown Granny Smith apple shows a few blemishes.
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Johnson County
The look of water can be deceiving, and the clearest waters can also be the most unsafe to drink or live in.
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Sioux City
It is often very windy in Iowa, and those winds typically cause it to feel much cooler than the air temperature would suggest.
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Johnson County
The amount of filamentous and periphytic algae (growing on plants) over a four-week period was visibly reduced after an early summer bloom.
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Cedar Falls
The Daryl Smith Prairie includes many diverse plants including natural plants native to Iowa.
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Waterloo
Most types of E. coli are harmless or cause minor symptoms, but a few strains can cause more serious problems. Monitoring can help reduce these risks.
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Sioux Center
When the weather turns cold, the grass observably changes and turns brown. When leaves lose their color they shrivel up and decompose.
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Marion County
Since its completion in 1969, the Red Rock Reservoir has been filling with mud, and has lost a large portion of its storage capacity.
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Carroll
A privately owned flower garden contains black-eyed Susan flowers, which the owner never planted.
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Hazleton
Iowa land is abundant with both native and nonnative plant species and pollinators often interact with both.
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Belle Plaine
Certain plants grow during specific times of the year and others do not.
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Jasper County
Floating wetlands are a possible solution to reduce runoff.
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Waverly
Algae is a green substance that lives on the surface of Iowa lakes and ponds. While some types of algae are normal, most algae on the top of water is harmful to all living life.
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Waverly
The changing location of the sun in the Earth's sky will affect the appearance of shadows.
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Waverly
In the fall every year in Iowa there is a pattern of the leaves turning colors and ultimately falling off of trees.
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Iowa City
Increasing deer populations are causing issues in some areas.
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Manchester
Data from fish raceways show changes in oxygen levels as the water passes through raceways.
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Pleasant Hill
Rainscaping is a way to reduce the impact of stormwater runoff, especially in concrete laden cities.
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Solon
A cacophony of frogs and toads call out as they emerge from the mud in early spring and start looking for mates.
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