## Causal Patterns in Density

Use brass and aluminum cylinders while controlling for mass and volume to make the property of density more obvious.

## Causal Patterns in Ecosystems

Demonstrate the invisible role of decomposers in a food web, using glass worm tank and bread mold activities.

## Challenges with Sinkers

Manipulate aluminum foil and clay to make shapes that sink slowly.

## Describe a New Substance

Weigh amounts of baking soda and vinegar then mix them together. Weigh them again afterwards. Try this with open and then closed containers.

## Electrostatics Exhibits

Rub a clear plastic tube with different kinds of cloth to see how many Styrofoam chips can be picked up or moved around.

## Energy Flow in Communities

Begin a simple terrarium and maintain a Communities Chart to track the feeding relationships inside. Each time something is added, the impact is recorded on the increasingly complex chart.

## Evaporation and Condensation

Take two wet paper towels and enclose one. What will happen the next day? Watch as water droplets condense on the outside of a plastic cup filled with cold water.

## Exploratory Walk

Use all five senses and observation skills to explore a familiar location.

## Groundwater

Draw what a groundwater table might look like. Then use groundwater models to test the drawing.

## Life Cycles (Session 4)

“Mystery objects” – a brine shrimp egg and a seed that looks similar – are placed in both salt water and soil to see which thrives in each environment.

## Moon's Distance from Earth

Work with models to represent the relative distance of the Moon from the Earth, then measure the angular size of the Moon with pinky fingers to check the estimate.

## Scale Model of the Solar System

Draw scale models of the solar system and then go out to the playground. Establish the Sun’s position and ask students to stand where they think the planets are in relation to it.

## Soil

Compare the soil on school property to that of six very different locations. Then, try to guess where the soil was obtained.

## Systems and Interactions

Use Playdoh® and wax paper to simulate the collision between two tectonic plates.