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![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-829.png?itok=pvVmazG_)
Hold a Hill
Source Institutions
In this outdoor activity, learners investigate the relationship between the slope of a trail and soil erosion.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-828.png?itok=OA8tQTc6)
Bean Bugs
Source Institutions
In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-222.png?itok=xOa5mc9h)
Flocking for Food
Source Institutions
In this outdoor beach activity, learners use a variety of "beaks" (such as trowels, spoons or sticks) to hunt for organisms that shore birds might eat.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-209.png?itok=msyBfKMO)
Animal Diversity
Source Institutions
In this outdoor activity, learners find, count and compare as many different kinds of animals as they can find in two different areas: a managed lawn and a weedy area.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-774.jpg?itok=FTR0MS3p)
Counting With Quadrants
Source Institutions
Millions of organisms can live in and around a body of water.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-090.png?itok=APa2szKG)
Cardiac Hill
Source Institutions
In this outdoor activity linking human health to the environment, learners use their pulse rates as a measure of the effort expended in walking on different slopes.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-316.png?itok=UZdKzuvV)
Tree Tally
Source Institutions
In this outdoor activity and fun race, learners first find the most common type of tree in a forest site.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-043.png?itok=TDjOMFm6)
Cactus Wheel
Source Institutions
In this outdoor activity/field trip, learners explore the concept of population density.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-830.png?itok=jqd0vYid)
Great Steamboat Race
Source Institutions
In this outdoor activity, learners race small boats, made of cork, balsa wood, popsicle sticks etc., to investigate the rate and direction of currents in a stream or creek.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-831.png?itok=U8jdIO4O)
Cool It
Source Institutions
In this outdoor activity/game, learners use thermometers to simulate how lizards survive in habitats with extreme temperatures.