Tides

WALT understand how the tides work.

Fact Card#1: How does water move on the surface of the ocean?
The water in the ocean is constantly moving. On the surface, water moves in the form of waves.

Fact Card#2: How does water move below the surface of the ocean?
The water in the ocean is constantly moving. Below the surface, the water moves in great currents.

Fact Card #3: What are the two types of ocean currents?
Surface currents and Deep currents.

Fact Card #4: Define ocean currents.
Ocean currents are moving streams of water within the ocean.

Fact Card #5: Define the ‘surface current’.
Currents that move on or near the surface of the ocean are called surface currant.

Fact Card #6: List the factors which control the surface currents.
Air currents, Earth’s rotation and location of continents.

Fact Card#7: Which factors affect the flow of ocean surface water?

Global winds belts are a major factor affecting the flow of ocean surface water.

Fact Card#8: How are deep currents generated in the ocean?
Difference in the water density due to the temperature gradient moves the water and creates the deep currents.

Fact Card#9: Write down the characteristics of cold and warm water.
Cold water is more dense and it sinks and moves Warm

Fact Card #10: Which ocean currents travel faster?

Surface Currents.

Fact Card #11: Write the factors that cause the deep currents.

Deep ocean currents are caused by changes in the temperature salinity and density of the water.


         
Fact Card #12:
How do the Sun and the Moon cause the ocean currents?

The gravitational pull of the Moon and Sun is also an important factor to cause ocean currents.

Fact Card #13: Give the definition of wave.
A wave is a rhythmic movement that carries energy through matter or space.






Fact Card#14: What are the causes of waves?


Wind, Earthquakes, Gravitational force of the Moon and the Sun.

Fact Card#15: List the characteristics of a wave.
Wave length, wave height, crest, trough.
Fact Card#16: Write the parameters on which the wave height is
dependent.
Wind speed, Distance over which the wind blows, length of time the wind blows.

Fact Card #17: What happens during tide?
Tide is a periodic rise and the fall of sea level under the gravitational pull of the sun and moon.

Fact Card #18: What do you mean by high tide?
Water level is at its highest.

Fact Card #19: What do you mean by low tide?
Water level is at its lowest.
Fact Card #20: How does the Moon’s gravity pull ocean water?
The Moon’s gravity pulls the water on the Earth towards it. The water moves up into a slight bulge on the side of the Earth that faces the Moon.

Fact Card#21: What is the cycle duration of high/low tide?

Generally one high tide or low tide cycle happens every twelve hours.

Fact Card#22: Define tidal range.
The difference in ocean level between high tide and low tide.

Fact Card#23: When does spring tide occur?
When the Earth, Sun and Moon are in line.


Fact Card #24:
Which tides occur during a full/new moon?
Spring tides occur during the full moon and the new moon.
Fact Card #25: When does neap tide occur?
When the Moon and Sun are perpendicular to each other.

Fact Card #26: Which tides occur during the quarter moon?
Neap Tides.
Fact Card #27: Which tides are known as weak tides? Why?
Neap tides are weak tides as the gravitational forces of the Moon and Sun counteract each other, creating weaker tidal forces.
Fact Card#28: Which tides are known as strong tides? Why?
Spring tides are strong tides because the moon and the sun's gravitational force combine to create a strong tide.
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