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In this activity, learners discuss the different salinities of oceans, rivers and estuaries.

In this activity, learners explore how salt water freezes in comparison to fresh water.

In this activity, learners interact with a 3-D model of a watershed to better understand the interconnectedness of terrestrial and aquatic environments.

In this simulation, learners explore how ocean currents spread all kinds of pollution—including oil spills, sewage, pesticides and factory waste—far beyond where the pollution originates.

In this activity, learners are challenged to design a planktonic organism that will neither float like a cork nor sink like a stone.

This experiment is designed to illustrate how fluids, including water, have the ability to flow.

In this activity, learners make a model of the hot water of a deep sea vent in the cold water of the ocean to learn about one of the ocean's most amazing and bizarre underwater habitats.

Using simple, inexpensive items, learners build and test submarine models.

In this earth science activity (page 14 of the PDF), learners use layers of closed-cell foam to create their own model of the mid-ocean ridge in order to simulate seafloor spreading.

In this activity, learners are introduced to robotic submarines called gliders. Learners make “gliders” from plastic syringes and compare these to Cartesian bottles and plastic bubbles.

In this activity, learners explore in what ways the shape of the land and the pull of gravity influence how water moves over Earth.

Water on Earth is in lakes, the ocean, rivers, underground, and frozen glaciers.

Where rainwater goes after the rain stops? And why there are rivers and lakes in some parts of the land but not in others?

In this 6-7 day investigation, learners begin with an introduction to seamounts that are present in the Gulf of Alaska.

In this edible experiment, learners pour "Magic Shell" chocolate into a glass of cold water. They'll observe as pillow shaped structures form, which resemble lavas on the sea floor.

Learners model the ocean currents that carry hot water from the tropics to northern latitudes.

In this activity (Lesson 1), learners work in groups to create tide simulations.

In this activity, groups of learners work together to create edible models of chemicals involved in autotrophic nutrition.

This activity provides a hands-on experience with a scale model, a relatively high viscosity fluid, and feeding behaviors.

Educator Amy O'Donnell from the American Museum of Natural History guides learners to create a diorama of a coral reef.