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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 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 on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.

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

In this experiment, learners float colored ice cubes in hot and cold water.

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.

In this activity, learners act as water molecules and travel through parts of the water cycle to discover that it is more complex than just water moving from the ground to the atmosphere.