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All Book Chapters

Body Waves

Book Chapter

Body Waves

Waves are among the most common phenomena in nature. Waves breaking in the ocean, sound, light, microwaves, radio, or the motion of a guitar cord or a drum are all forms of waves. Such diversity makes finding common properties a challenge but, in ge...

Waves and Wind in a Box

Book Chapter

Waves and Wind in a Box

What are some of the ways you can make waves in water? Have you ever jumped into a pool or lake and done a “cannonball”? This makes waves. The largest water waves on Earth are found in the oceans, and most ocean waves are created by wind. The lar...

Tanks a Lot—Activities for a Wave Tank (Teacher Demonstration)

Book Chapter

Tanks a Lot—Activities for a Wave Tank (Teacher Demonstration)

Some concepts related to waves, though, are difficult to demonstrate in the classroom. They require observing water waves on a scale that is not ordinarily feasible for the classroom teacher because the necessary equipment is not available. The teach...

Plotting Tidal Curves

Book Chapter

Plotting Tidal Curves

Anyone who has been to the coast realizes there is a rhythm to the ocean. Waves crash onto the beach or rocks. The water they carried washes ashore, then retreats. Another wave crashes ashore. The pattern repeats. However, there is another rhythmic p...

Tides Mobile

Book Chapter

Tides Mobile

The Sun, Moon, and Earth are three extremely large objects separated by great distances. Despite the large distances between them, each object affects the others. Earth is kept in orbit around the Sun by the gravitational forces between them. The Moo...

The Bulge on the Other Side of Earth

Book Chapter

The Bulge on the Other Side of Earth

The bulge of water on the side of Earth that faces the Moon is easily explained. It is due to the gravitational attraction between the Moon and Earth, including the water on Earth. The difference on the horizontal component of gravity results in wat...

Oily Spills

Book Chapter

Oily Spills

Telephones, clothing, skis, antihistamines, ballpoint pens, music cassettes, toilet seats, antifreeze, and gasoline: What do these items have in common? All are often made from oil. The United States, like other industrialized nations, bases much of ...

Forever Trash

Book Chapter

Forever Trash

Hundreds of thousands of boats and ships and the materials and supplies on them have sunk to watery graves since humans first sailed the oceans. Even today, it is common practice for humans to throw their waste into the seas. In the past, much of tha...

A Pile of Water

Book Chapter

A Pile of Water

A substance’s molecular structure is responsible for its properties and governs how it interacts with other things on Earth. This Activity introduces and explores one specific property of liquid water. This sample chapter also includes the Table of...

Water: The Sum of Its Parts

Book Chapter

Water: The Sum of Its Parts

Water has many peculiar properties: high specific heat capacity, strong ability to act as a solvent, and the ability of the solid phase of water (ice) to float on its liquid phase. Many of the peculiar properties of water are directly related to the ...

A Sticky Molecule

Book Chapter

A Sticky Molecule

Water is one of the simplest chemical substances on Earth, and yet we must have it to live. In this Activity, you will learn how hydrogen and oxygen join and investigate some characteristics of the bond between them. Knowing the molecular structure o...

The Ocean

Book Chapter

The Ocean

The characteristics of the different parts of the ocean vary depending on the region. While the coastal ocean changes rapidly and presents the largest amount of biological activity, it also shows the largest exchanges with the continents through the ...

Over and Under— Why Water’s Weird

Book Chapter

Over and Under— Why Water’s Weird

Understanding water’s molecular structure helps explain some of its characteristics. Density is the mass of an object divided by its volume. In this Activity, you will look at how heating affects the density of different substances....

The Tides: A Balance of Forces

Book Chapter

The Tides: A Balance of Forces

The interaction between the gravitational forces of Earth, the Moon, and the Sun causes tides. The rhythmic movement of the water associated with the tides causes successive high and low waters in the coastal areas. ...

How Water Holds Heat

Book Chapter

How Water Holds Heat

Earth’s surface is mostly covered by water. Areas not covered by water—the continents—are surrounded by water. If land and water had the same specific heat, we would expect the land and surrounding water to heat up and cool down at the same rat...

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