Coasts - Theme 2 - TIDES

Question 1

What causes the tides

Answer 1

-Gravitational pull of the moon and sun

Question 2

What is tidal range

Answer 2

-range between high and low water mark

Question 3

When is there a high tide

Answer 3

• when the earth points towards the moon then a high tide occurs as gravity pulls the ocean towards the moon
• likewise the opposite of the world has a high tide
• 90 degrees will have a low tide

Question 4

When is there a low tide

Answer 4

-When the ocean is 90 degrees from the moon

Question 5

What is a spring tide

Answer 5

• When the moon and sun both have an effect on the ocean
• When the moon and the sun are in allignment there is a spring tide
• two a year

Question 6

what is a neap tide

Answer 6

• When the moon and sun both have an effect on the ocean
• when the moon and sun are at 90 degrees
• two a year

Question 7

What does a low tidal range not cause for the coast

Answer 7

• less wave energy

- less erosion

Question 8

What does a high tidal range cause

Answer 8

• high wave energy

- more erosion

Question 9

What is a macro tidal

Answer 9

-large tidal range - bigger then 4m

Question 10

What is a meso tidal range

Answer 10

-between 2-4m

Question 11

What is a micro tidal

Answer 11

-less then 2m

Question 12

What is a strom surge

Answer 12

• an area of low pressure on the surface of sea means sea level rises due to less pressure
• 1cm for 1 millibar(mb) drop

Question 13

How does a strom surge form

Answer 13

• Strong winds
• low pressure system allows low pressure over the sea (depression)
• sea level rises underneath - 1cm for 1mb drop
• piles up against the coast

Question 14

What areas of the UK are effected by storm surges

Answer 14

• North sea
• East coast
• funnels the water