Tides Flashcards
What are the 2 factors that create tides
Gravitational force and Centripetal acceleration
In 24 hours you’ll have high tide and low tide every _ hours
6
Full moon
Is when the moon is directly on top of the earth and is being pulled by the sun which is pulling the tides up making them higher
New moon
Is when the moon is directly below of the earth and is pulling the tides down making them higher
First quarter
Is when the moon is directly on the left of the earth and is pulling the tides to the side making them lower
Third quarter
Is when the moon is directly on the right of the earth and is pulling the tides to the side making them lower
a Full moon and a New moon are causing the ____ for the tides
Highest Highs
First quarter and the Third quarter are causing the ___ for the tides.
Lowest Lows
Moon has an effect of __ more than the sun because it;s CLOSER
2.16
Semidiurnal tides
Two highs and two lows that are both at equal levels that take place in 24 hours
Diurnal
One high and One low that are almost equal that take place in 24 hours
Mixed Semidiurnal tides
Two highs and two laws that are completely not equal that take place in 24 hours
We get the smallest tides when we’re the closest to the sun which is called
Perihelion
We get the strongest tides the farthest away from the moon which is called
Apogee
Tidal current
the currents observed as water rushes in or out bays and harbors
during the tidal cycle.
Flood current
water rushing into an enclosed area as a result of tides (“coming in”)
Ebb current
water rushing out of an enclosed area as a result of tides (“going out”)
Slack water
a time of no-current when there is a shift in direction of the flow during high or low tide. That is when we are moving from ebb to flood or vise versa
Tidal range
high-water to low-water range during a tidal cycle
Intertidal zone
coastal region between the highest high tide and the lowest low tide
Mean sea level
the height of the low water level averaged over period of record
(not the actual average level of the sea/ocean).
Tidal friction
the frictional force of tides on the earth’s rotation…
Tidal bore
a tidal wave that goes up a river or shallow estuary, often with an abrupt leading edge (look it up online – there are some cool videos on this!)
