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Understanding Earth systems
Questions Worksheet
WALT understand Earth systems.
Contex: moon, tides, ocean curents
Fact Card#1: How does water move on the surface of the
ocean? The water moves in forms of waves.
ocean? The water moves in forms of waves.
Fact Card#2: How does water move below the surface of the ocean? The water moves in a current below the surface.
Fact Card #3: What are the two types of ocean currents?
The two currents are surface currents and deep currents.
The two currents are surface currents and deep currents.
Fact Card #4: Define ocean currents. The ocean currents
are moving in streams of water
are moving in streams of water
Fact Card #5: Define the ‘surface current’.
A surface current is a current on or near the surface.
Fact Card #6: List the factors which control the surface
currents.
currents.
The three factors are air currents, Earth's rotation and
location of the continents.
location of the continents.
Fact Card#7: Which factors affect the flow of ocean surface
water? Global wind belts are a major factor affecting the
flow of surface water.
water? Global wind belts are a major factor affecting the
flow of surface water.
Fact Card#8: How are deep currents generated in the
ocean? Difference in the water temperature gradient
moves the water and creates the deep currents.
ocean? Difference in the water 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 water is less dense and it rises up.
and warm water. Cold water is more dense and it sinks
and moves. Warm water is less dense and it rises up.
Fact Card #10: Which ocean currents travel faster?
Surface currents travel much faster than any other curent.
Surface currents travel much faster than any other curent.
Fact Card #11: Write the factors that cause the deep currents.
Deep ocean currents are caused by changes in the
temperature, salinity (how salty the water is and density
of the water.
Deep ocean currents are caused by changes in the
temperature, salinity (how salty the water is and density
of the water.
Card #12: How do the Sun and the Moon cause the ocean
currents? The gravitational pull of the moon and the sun is
also an important factor to cause ocean currents.
currents? The gravitational pull of the moon and the sun is
also an important factor to cause ocean currents.
Fact Card #13: Give the definition of wave. The definition
of a wave is a rhythmic movement that carries energy
through matter or space.
of a wave is a rhythmic movement that carries energy
through matter or space.
Fact Card#14: What are the causes of waves?
Waves are caused by earthquakes, wind and gravitational
force of the moon and the sun.
force of the moon and the sun.
Fact Card#15: List the characteristics of a wave.The
characteristics of a wave are wavelength, wave height,
the two crests and trough. The parts of the wave.
characteristics of a wave are wavelength, wave height,
the two crests and trough. The parts of the wave.
Fact Card#16: Write the parameters on which the wave
height is dependent? Wind speed, Distance over which
the wind blows and length of time(Fetch)the wind blows.
height is dependent? Wind speed, Distance over which
the wind blows and length of time(Fetch)the wind blows.
Fact Card #17: What happens during tide? Tide is a periodic
rise and fall of the sea level under gravitational pull of the
sun and moon.
rise and fall of the sea level under gravitational pull of the
sun and moon.
Fact Card #18: What do you mean by high tide? The high
tide water lever is at its highest.
tide water lever is at its highest.
Fact Card #19: What do you mean by low tide? The water
level is at its lowest.
level is at its lowest.
Fact Card #20: How does the Moon’s gravity pull ocean
water? The water moves up into a slight bulge on the side
of the earth that faces the ocean.
water? The water moves up into a slight bulge on the side
of the earth that faces the ocean.
Fact Card#21: What is the cycle duration of high/low tide?
Generally one low-tide/high tide cycle takes at every 12
hours and 25 minutes
Generally one low-tide/high tide cycle takes at every 12
hours and 25 minutes
Fact Card#22: Define tidal range. The difference in ocean
level between high-tide and low tide is called tidal range.
level between high-tide and low tide is called tidal range.
Fact Card#23: When does spring tide occur? Spring tides
occur when the earth, moon and sun are in a line.
occur when the earth, moon and sun are in a line.
Fact Card #24: Which tides occur during full/new moon?
Spring tides occur during full moons and new moons.
Fact Card #25: When does neap tide occur? Neap tides
occur when the moon and sun are perpendicular to each
other.
occur when the moon and sun are perpendicular to each
other.
Fact Card #26: Which tides occur during the quarter moon?
Neap tides.
Neap tides.
Fact Card #27: Which tides are known as weak tides? Why?
Neap tides are weak tides because the gravitational forces
of the moon and the sun counteract each other, creating
weaker tidal forces.
Neap tides are weak tides because the gravitational forces
of the moon and the 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.
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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