Before you read the passage, talk about these questions.

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veer

current

ebb

wind

high tide

low tide

Tides, Winds, and Current

Get ready!

1. Before you read the passage, talk about these questions.

       1 What are some important factors to consider when entering or leaving port?

       2 What are some of the difficulties with measuring wind speed and direction?

Reading

2. Read the textbook excerpt. Then, choose the correct answers.

1 What is the mam purpose of the chapter?

A to introduce students to the history of wind measurement techniques

В to report on new developments in mapping currents

С to inform students about how to safely leave or enter a port

D to explain the rules that govern ships entering and leaving port

2 Which of the following subjects is NOT covered in the chapter?

       A the effects of the tide on the shoreline

В measuring the drift and set of the tide

С combining relative velocity and true wind measurements

D non-technological wind measurement

3 According to the excerpt, how does one measure apparent wind?

A by calculating relative velocity

В by combining the set and drift

С by measuring true wind at high tide

D fry combining true wind and relative velocity

Vocabulary

3. Match the words and phrases (1-8) with the definitions (A-H).

       1__drift

2 __current

       3 __ high tide

4 __ low tide

       5 __ true wind

6 __ wind speed

       7 __ Beaufort Scale

8 __ relative velocity

A technique for measuring wind

speed and direction

В measurement of air movement in knots

С the period when the ocean reaches farthest up the shore

D the movement of air created by an object's motion

E the movement of water in a particular direction

F the period when the ocean covers the least amount of the shore

G the natural speed and direction of air movement

H the direction in which water is moving

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