Currents (AQA A-Level Geography): Flashcards
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Practise the cards
10 cards from this deck
Current (definition)
Current (definition)
Continuous/periodic movement of surface water in seas & oceans
Longshore currents
Longshore currents
Current flowing parallel to shore when waves hit at an angle
Longshore drift pattern
Longshore drift pattern
Zigzag: swash at angle up beach, backwash straight down
Rip currents
Rip currents
Powerful, narrow channels of water flowing away from shore
Upwelling
Upwelling
Cold water from deep ocean rises to surface
Cause of tides
Cause of tides
Gravitational pull of Sun and Moon
Why Moon has greatest tidal effect
Why Moon has greatest tidal effect
Moon is much closer to Earth than Sun
Spring tides timing
Spring tides timing
New moon and full moon phases (twice monthly)
Spring tides characteristic
Spring tides characteristic
Highest tidal range; Sun, Moon, Earth aligned
Neap tides
Neap tides
Lowest tidal range; at quarter moon, Sun/Moon at 90°