# Oceanography Chapers 9-11

Topics: Tide / Pages: 11 (2689 words) / Published: Jun 11th, 2012
Chapter 9

Review Questions

Explain why the Sun's influence on Earth's tides is only 46% that of the Moon's, even though the Sun is so much more massive than the Moon. although the sun is much larger than the moon and has much more gravitational power, the distance between the earth and the moon is extremely further than the distance between the earth and moon. so much that it greatly dampens the effect of the suns gravity.

Why is a lunar day 24 hours and 50 minutes long, while a solar day is 24 hours long? This happens because the moon revolves around the Earth in the same direction that the Earth is rotating on its axis. Therefore, it takes the Earth an extra 50 minutes to catch up to the moon.

Which is more technically correct: The tide comes in and goes out: or Earth rotates in and out of tidal bulges. Why?

Explain why the maximum tidal range (spring tide) occurs during new moon and full moon phases and the minimum tidal range (neap tide) at first-quarter and third-quarter moons.

If Earth did not have the Moon orbiting it, would there still be tides? Why or why not? yes, because the sun is also a factor in tides.

What is declination? Discuss the degree of declination of the Moon and Sun relative to Earth's Equator. What are the effects of declination of the Moon and Sun on the tides? declination is the angular distance of the sun or moon above or below earth's equatorial plain.

Are tides considered deep-water waves anywhere in the ocean? Why or why not? A deepwater wave is where the ocean depth is at least half of the wavelength. Since the wavelength of tides is about 15,000 kilometers, it is impossible for the tides to be deepwater waves.

Describe the number of high and low tides in a lunar day, the period, and any inequality of the following tidal patters: diurnal, semidiurnal, and mixed. a lunar day is the period of time it takes for the Earth to complete one full rotation on its axis with respect to the