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

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

Water flows in a horizontal pipe that is narrow but then widens and the speed of the water becomes less. The pressure in the water moving in the pipe is (a) greater in the wide part. (b) greater in the narrow part. (c) the same in both parts. (d) greater where the speed is higher. (e) greater where the speed is lower.

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.

A steady stream of water falls straight down from a pipe. As- sume the flow is incompressible; the flow is similar to earlier Fig. How does the pressure in the water vary with height in the falling stream? $\quad(A)$ The pressure in the water is higher at lower points in the stream. $\quad(B)$ The pressure in the water is lower at lower points in the stream. $\quad(C)$ The pressure in the water is the same at all points in the stream.

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

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.

What materials make up an aquifer layer?

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 was Benjamin Franklin interested in the Gulf Stream?

What is the importance of the Gulf Stream?

Why were some southern leaders worried about the South's reliance on cotton?

What is a mesocyclone and how does it form?

What is a mesocyclone?