Oceanography 101

Quiz Questions - Chapter 11 - Tides

1. The force primarily responsible for tides is:
a) gravity.
b) friction.
c) the Coriolis effect.
d) wind pressure.

2. What is the relative tidal forces of the Sun and Moon as they impact the Earth?
a) The Sun and Moon exert equal tidal forces on the Earth.
b) The Sun exerts about twice the tidal force of the Moon.
c) The Sun exerts three times the tidal force of the Moon.
d) The Moon exerts about twice the tidal force of the Sun.

3. When water currents flows out to sea as tide levels fall is called a:
a) ebb tide.
b) spring tide.
c) flood tide.
d) neap tide.

4. When the Moon is closest to the Earth is called:
a) apogee.
b) perigee.
c) aphelion.
d) perihelion.

5. When do spring tides occur?
a) during new moon & full moon phases
b) during first quarter & third quarter moon phases
c) in March and April in the Northern Hemisphere
d) all of the above.

6. How many high tides occur per day in most coastal areas (on most days, including in San Diego)?
a) 1
b) 2
c) 3
d) 4

7. Where are the greatest tidal ranges on Earth found?
a) In large lakes like Lake Ontario.
b) In narrow bays like the Bay of Fundy in Canada.
c) In polar oceans like the Arctic Ocean.
d) In the largest oceans, particularly the Pacific.

8. The intertidal zone is:
a) the area between the high tide mark and dunes, a sea cliff, or permanent vegetation.
b) the area between the low and high tide marks.
c) a platform formed by depositional processes along the beach.
d) the area between the beach and a barrier island.

9. Which is NOT true about sea level?
a) Sea level is a equal everywhere.
b) Sea level is influenced by variations in the gravitational field of the lithosphere.
c) Sea level is about 20 cm higher on the Pacific side of North America than the Atlantic.
d) Sea level is influenced by the regional density of seawater.

10. The zone that is the typically vegetation free, splash or spray zone above the high water line where back-beach dunes accumulate is called:
a) the subtidal zone.
b) the intertidal zone.
c) the supratidal zone.
d) the wrackline.