an align="justify"> Semi-diurnal tide (SD) - Two complete tidal oscillations daily, both high waters having similar heights as well as both low waters.
Mixed, semi-diurnal (MSD) - Two complete tidal oscillations daily with inequalities both in height and time reaching the greatest values ​​when the declination of the moon has passed its maximum.
Fill in: a)
b) _
c)
d)
e)
f> )
Exercise 2. Read the text "Tides" attentively to answer the following questions:
What effect are tides mainly created by?
What are centrifugal forces caused by?
What forces produce exceptionally strong tides?
What are these tides called?
As a result of what are neap tides produced?
When do we speak of slack tides?
Why is high slack tide especially important to me mariner?
Exercise 3. Pick out false sentences out of those below and correct them. ol>
The moon is at a nearer distance from the earth than the sun.
The sun is at a far greater distance from the moon than the earth.
The earth is at a far greater distance from the moon than the sun.
The effect of the moon's gravity on the tides is much weaker of that of the sun.
Spring tides occur when the sim and the moon are at 90 degrees to each other.
Neap tides are called weak tides.
The sun, the moon and the earth are in line every week.
Spring tides are produced at new and full moon.
At Low Slack the tide is about to fall.
At High Slack the tide is about to turn.
When the tide is turning we speak of Low Slack.
High Slack is the best tide to leave and proceed to open sea.
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~ ~ 4 Exercise 4. Watch the CD-ROM program "International MarirВ» time English Programme "(Tides. Lectures) and do the test
Exercise 5. Choose the correct variant of a, b, c, dare created by the ...
rotation of the earth;
gravitational effect of the moon on the earth;
effect of the sun's gravity;
gravitational effect of the moon and the sun on the earth.
Spring tides are produced by the ...
gravitational effect of the moon;
effect of the sun's gravity;
centrifugal forces;
two gravitational forces when the sun and the moon are both in line with the earth.
Neap tides are produced by the ...
gravitational effect of the moon;
pull of the sun;
gravitational effect of the sun and the moon at 90 degrees to each other;
centrifugal forces caused by the rotation of the earth.
Slack tides will occur ...
every other week;
when the sun and the moon are at 90 degrees to each other;
when the sun and the moon are both in line with the earth;
when the tide is turning.
At Low Slack water the tide is about ...
to turn;
to rise;
to fall;
d) to be cancelled outHigh Slack water the tide is about ...
to turn;
to rise;
