A sheet of water passing over a waterfall is thicker near the top than near the bottom. Similarly, a stream of water emerging from a water faucet becomes narrower as it falls. Explain.

What does the associated graph indicate about a stream?

A. Silt and clay are carried in suspension under most stream velocities.

B. Sand and gravel are deposited at low velocities but transported at higher velocities.

C. Sand is carried in suspension only at high velocities.

D. As fast-moving water slows down, fine sand can switch from transport by suspension to the bed load.

E. All of these.

Water slows down when it reaches (permeable/impermeable) material.

As a stream slows down, which sediments are deposited first—large ones or small ones?

Water slows down when it reaches (permeable/impermeable) material.

A stream becomes a river as it moves down gradient. Give the sequence in the evolution of a stream: (a) meandering pattern, (b) rapids, (c) delta.

Identify a wave that speeds up when it passes from air to water as well as one that slows down.

What materials make up an aquifer layer?

Since metal is more dense than water, how is it possible for a metal boat to float?

One day, while snorkeling near the surface of a crystal-clear ocean, it occurs to you that you could go considerably deeper by simply lengthening the snorkel tube. Unfortunately, this does not work well at all. Why?

Physics in the Movies In the movie Voyage to the Bottom of the Sea, the Earth is experiencing a rapid warming. In one scene, large icebergs break up into small, car-size chunks that drop downward through the water and bounce off the hull of the submarine Seaview. Is this an example of good, bad, or ugly physics? Explain.

If the average temperature of the North Atlantic is $12.0^{\circ} \mathrm{C}$ and the Gulf Stream temperature averages $17.0^{\circ} \mathrm{C}$, estimate the net amount of heat the Gulf Stream radiates to the surrounding ocean. Use the details of Solved Problem $18.3$ (the length is about $8.00 \cdot 10^3 \mathrm{~km}$ ) and assume that $e=0.930$. Don't forget to include the heat absorbed by the Gulf Stream.

Why is it possible for people to float without effort in Utah's Great Salt Lake?

How does a balloonist control the vertical motion of a hot-air balloon?