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In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern.

This is an activity that models the operation of a seismograph, a tool used to measure the size of earthquakes.

In this activity, learners hook up a hair to a lever system and create a hair hygrometer to measure changes in humidity.

Did you know that you would be a different age if you lived on Mars? It's true!

Ocean acidification is a problem that humans will have to deal with as we release more and more carbon dioxide into the atmosphere.

Did you know that a Slinky makes a handy model of earthquake waves?

In this activity, learners measure and calculate the amount of cubic feet various containers contain. Next, learners investigate cubic feet per second (cps), by carrying jugs in one second.

In this seismic simulation, learners play a "who-dunnit" game to explore earthquakes.

In this activity, learners (at least three) work together to explore the effects of atmospheric pressure.

In this activity, learners eat a snack and make a model of the plumbing system of a volcano.

In this classic hands-on activity, learners estimate the length of a molecule by floating a fatty acid (oleic acid) on water.

In this group activity, learners use some common objects and work together to simulate the Coriolis effect. During the challenge, learners make predictions and test different scenarios.

Ocean acidification is a big issue due to the amount of carbon dioxide humans release. CO2 in the atmosphere is absorbed into the ocean thus changing its acidity.

In this activity, learners calculate the percentage of oxygen in the atmosphere by using steel wool's ability to rust.

This is a quick activity that shows how large amounts of rock and sediment are added to the edge of continents during subduction.

This activity guide includes instructions on how to build a "Shake Table" by mounting an eccentric mass (off center) on the shaft of a small dc motor.

In this activity, learners build a tool called an inclinometer that can find the height of any distant object, from a tree to the North Star.

This is an activity to do when there is a solar eclipse!

This activity demonstrates liquefaction, the process by which some soils lose their solidity during an earthquake.

It's difficult to see convection currents in any liquid that's undergoing a temperature change, but in this Exploratorium Science Snack, you can see the currents with the help of food coloring.