Lecture 7- Ocean Tides Flashcards
1
Q
diurnal
A
- one high tide and one low tide per day
- one peak on graph
2
Q
semidiurnal
A
- two equal high tides and two equal low tides per day
- two peaks on graph
3
Q
mixed semidiurnal
A
two unequal high tides and two unequal low tides per day
4
Q
tide rises when
A
a point on earth is aligned right under the moon or on the opposite side of the moon
5
Q
tide falls when
A
a point on earth is 90 degrees away from the earth
6
Q
What creates two tidal bulges and causes the regular rise and fall of the tides?
A
- gravitational force
- centrifugal force on opposite sides of the earth
7
Q
How long is a tidal day?
A
- 24 hours and 50 minutes
- takes 50 minutes for the earth to rotate 12 degrees longitude
8
Q
Barycenter
A
the point the moon orbits around (not the center of earth)
9
Q
high latitude
A
diurnal tides
10
Q
midlatitude
A
mixed
11
Q
low latitude
A
semidiurnal tides
12
Q
spring tides
A
- occur when the moon pulls along the same line as the sun
- new and full moon
- tide is exaggerated
13
Q
neap tides
A
- occur when the moon pulls 90 degrees to the sun
- first and last quarter moon
- tide is not as exaggerated
14
Q
daily tide patterns
A
- diurnal
- semidiurnal
- mixed
15
Q
monthly tide patterns
A
- spring tides
- neap tides
