Tides

Question 1

What defines spring tides?

Answer 1

1. highest high tides and lowest low tides in this cycle:

2. sun and moon line up to create stronger pull

Question 2

What defines neap tides

Answer 2

1. lowest high tide and highest low tide

2. sun and moon do not line up their gravitational pulls

Question 3

Three types of tides

Answer 3

Semi-dinurnal tides
mixed tides
diurnal tides

Question 4

Define semi-diurnal tides

Answer 4

2 highs and lows per day

Question 5

Define diurnal tides

Answer 5

1 high and one low per day

Question 6

Define mixed tides

Answer 6

semi-diurnal signal modulated by diurnal signal

Question 7

Tidal bore: define.

Answer 7

a steep-fronted wave that moves up rivers as the tide increases

Question 8

Define tidal currents

Answer 8

The horizontal motion of water during tides. It flows in and out!

Question 9

what are two driving forces of oceans

Answer 9

Wind and drag created at the ocean surface

Differences in density between water masses

Question 10

What is the primary driver of surface currents?

Answer 10

Wind

Question 11

What is the primary driver of deep water currents?

Answer 11

density

Question 12

What is the factor that drives all sorts of currents?

Answer 12

the transfer of heat from tropics to the poles.

Question 13

Define ekman spiral

Answer 13

coriolis force applied to wind-driven surface currents

Question 14

what causes el nino?

Answer 14

reductionor reversal of southeast trade winds from decrease differences between high and low pressure zones

Question 15

consequences of el ninos (5)

Answer 15

1. cooler upwelling waters forced downward
2. Thermal expansion of water increases water level
3. Bleaching
4. decrease of upwelling nutrient rich water from bottom