Question

The vertical difference high tide and low tide is ______ ?
a. Tidal range
b. Tidal width
c. Tidal height
d. None of these

Answer 1

Hint:
Tidal range is the height difference between high tide and low tide. Tides are the rise and fall in sea level due to gravitational forces by the Moon and the rotation of the Sun and Earth. The tidal range is not constant but changes depending on the locations of the Moon and the Sun.

Complete answer:
The most extreme tidal range occurs during spring tides, when the gravitational forces of both the moon and the sun align (co-ordinate), reinforcing one another within the same direction (new moon) or in the opposite direction (full moon).

During neap tides, when the gravitational force of the moon and the sun act in quadratic (forming a right angle in the Earth's orbit), the difference between high and low tides is small. Neap tides occur during the first and last quarters of the phases of the moon.

The greatest annual recurrent events vary are often expected round the time of the equinox if it coincides with a spring tide. Tidal data for coastal areas are published by the National Hydrographic Services. The data is based on astronomical phenomena and is predictable.

Hence, the correct answer is option A.

Note:
 Mean tidal range is calculated as the difference between mean high water (ie, average high tide level) and mean low water (mean low tide). Continuous storm winds blowing from one direction combined with low barometric pressure can increase the tidal range, especially in narrow rays. Such meteorological effects on tides, which may exceed predicted values ​​and cause localized flooding, are not computable in advance.