Currents

Question 1

Rip currents

Answer 1

Small channel where back wash finds it easier to move back as can move under next wave
Forms river going an out to sea
Positive feedback loop

Question 2

Gulf Stream facts

Answer 2

Adds 12 degrees to UK
5 billion gallons of water sinks each second when it is cold- goes vertically down and this one point drives whole system

Question 3

Ocean currents are

Answer 3

Continuous directed movement of seawater generated by foxes acting upon the mean flow

Question 4

10000 years ago Gulf Stream …
And why

Answer 4

Stopped causing ice age
Because frozen river broke and lots of freshwater entered the sea
Fresh water stopped the pump

Question 5

Key factor of ocean currents

Answer 5

Salinity

Question 6

By 2065

Answer 6

Gulf Stream could shut down due to climate change effecting melting of Greenland glaciers

Question 7

Downwelling

Answer 7

Land cools water
Sinks
Moves further from land
Becomes warmer
Rises
Convection current forms

Question 8

Problems with downwelling

Answer 8

Nutrients washed out to the deep sea
Affect marine ecology

Question 9

Upwelling

Answer 9

Cooler water
Warmer land
Opposite to downwelling
Cold water moves to land warms and rises

Great for fishing grounds and nutrient near shore

Question 10

El Niño va what is normal

Answer 10

5-6 year ga
Unknown cause

Normal
Cold water from poles flows to South America and up coast and it warms then moves to Australia

El Niño
Flips and warm water flows from west to east

Question 11

Consequences of El Niño

Answer 11

Australia loses heat
South America get warmer
Central Australia warmer as no cloud cover
North America has warmer winters
UK colder and drier winter and warmer and drier summrs

Affects all oceans and ocean currents globally

Question 12

La Niña

Answer 12

Smaller version of El Niño