The Causes of Tides and Their Effects on Earth

 
High or Low - What Causes Tides?
 
What Are Tides?
 
Tides are the daily 
rise
 and 
fall
 of Earth’s
waters
 on its coastlines.
As the tide comes 
in
, the level of water on
the beach 
rises
, and as the tide goes 
out
,
the level of water on the beach goes 
down
.
Tides occur in 
all 
bodies
of water, but they are most
noticeable in the 
ocean
 and
large 
lakes
.
 
High Tides
 
High tides are when the water reaches
its 
highest 
point.
 
Low Tides
 
Low tides are when the water reaches
its 
lowest 
point.
 
What Causes Tides?
 
Tides are caused by the 
interaction
 of
Earth, the Moon, and the 
Sun
.
Gravity
 is the reason for tides.
Gravity is the 
force
exerted by an object
that 
pulls
 other objects
toward it.
 
 
Moon’s Gravity and Tides
 
The Moon’s 
gravity
 affects the 
water
 on
Earth’s surface.
Since the Moon is 
close
 to the Earth, it
has a 
strong
 gravitational pull on it
(closer objects have stronger gravitational
pull).
 
Moon’s Gravity – Tidal Bulges
 
The Moon pulls on the water on the side
nearest
 to it more 
strongly
 than it pulls
on the 
center 
of the Earth.
This 
pull
 creates a bulge of water, called a
tide bulge
,
on the side of
Earth
 facing                                               
the
the Moon.
 
Moon’s Gravity – Tidal Bulges
 
The water on the side of Earth facing 
away
 from
the Moon has a 
less
 strong pull.
This water is “
left behind
” and forms a 
second
bulge.
As Earth 
rotates
,
different places on the
planet’s surface pass
through the areas of the
tidal
 bulges and have
the change in water levels.
 
 
Tidal Bulges – High Tide
 
In places where there are tidal bulges, 
high
tide 
is occurring along the coastlines.
 
High
Tide
 
High
Tide
 
Tidal Bulges – Low Tide
 
In places 
between
 the bulges, 
low
 tide is
occurring.
 
LOW TIDE
 
LOW TIDE
 
Sun’s Gravity and Tides
 
The Sun is so 
large
that its 
gravity
 also
affects tides.
At times, the 
Sun
 and
Moon 
pull together
on Earth’s waters in
the 
same 
direction.
At other times they
pull in 
different
directions.
 
Daily Tide Cycle
 
 Most seashores have 
four 
tides every day –
two
 high tides and 
two
 low tides.
A 
change 
of from low to high tide or vice
versa takes about 
6
hours and 
12 
minutes.
Changes in tides can
be 
drastic
 (can notice)                               or
or 
less
 dramatic (can’t
notice).
 
Monthly Tide Cycle
 
 
Changes in the 
positions
 of Earth, the Moon,
and Sun affect the 
height
 of tides during a
month.
 
Spring Tides
 
Spring
 tides occur 
2
 times a month, during
a 
full
 and 
new
 moon when the Earth, Sun,
and Moon are lined up.
Spring tides are 
higher 
and 
lower
 than
normal tides.
strong
 tides”
 
Neap Tides
 
 
Neap
 tides occur in between spring tides,
at the 
first
 and 
third
 quarters of the
Moon when the Sun and Moon pull at
right 
angles to each other.
Neap tides are 
not
as high or low as
normal tides.
weak
 tides”
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Tides are a result of the gravitational interactions between Earth, the Moon, and the Sun. The Moon's gravity creates tidal bulges on Earth's surface, leading to the daily rise and fall of water levels known as tides. These phenomena have a significant impact on ocean coastlines and the overall water flow on our planet.

  • Tides
  • Gravitational interactions
  • Moons gravity
  • Oceanic phenomena
  • Earths water

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  1. High or Low - What Causes Tides?

  2. What Are Tides? Tides are the daily rise and fall of Earth s waters on its coastlines. As the tide comes in, the level of water on the beach rises, and as the tide goes out, the level of water on the beach goes down. Tides occur in all bodies of water, but they are most noticeable in the ocean and large lakes.

  3. High Tides High tides are when the water reaches its highest point.

  4. Low Tides Low tides are when the water reaches its lowest point.

  5. What Causes Tides? Tides are caused by the interaction of Earth, the Moon, and the Sun. Gravity is the reason for tides. Gravity is the force exerted by an object that pulls other objects toward it.

  6. Moons Gravity and Tides The Moon s gravity affects the water on Earth s surface. Since the Moon is close to the Earth, it has a strong gravitational pull on it (closer objects have stronger gravitational pull).

  7. Moons Gravity Tidal Bulges The Moon pulls on the water on the side nearest to it more strongly than it pulls on the center of the Earth. This pull creates a bulge of water, called a tide bulge, on the side of Earth facing the the Moon.

  8. Moons Gravity Tidal Bulges The water on the side of Earth facing away from the Moon has a less strong pull. This water is left behind and forms a second bulge. As Earth rotates, different places on the planet s surface pass through the areas of the tidal bulges and have the change in water levels.

  9. Tidal Bulges High Tide In places where there are tidal bulges, high tide is occurring along the coastlines. High Tide High Tide

  10. Tidal Bulges Low Tide In places between the bulges, low tide is occurring. LOW TIDE LOW TIDE

  11. Suns Gravity and Tides The Sun is so large that its gravity also affects tides. At times, the Sun and Moon pull together on Earth s waters in the same direction. At other times they pull in different directions.

  12. Daily Tide Cycle Most seashores have four tides every day two high tides and two low tides. A change of from low to high tide or vice versa takes about 6 hours and 12 minutes. Changes in tides can be drastic (can notice) or or lessdramatic (can t notice).

  13. Monthly Tide Cycle Changes in the positions of Earth, the Moon, and Sun affect the height of tides during a month.

  14. Spring Tides Spring tides occur 2 times a month, during a full and new moon when the Earth, Sun, and Moon are lined up. Spring tides are higher and lower than normal tides. strongtides

  15. Neap Tides Neap tides occur in between spring tides, at the first and third quarters of the Moon when the Sun and Moon pull at right angles to each other. Neap tides are not as high or low as normal tides. weaktides

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