1. Moon Phases

2. Moon-Earth Relationship
The revolution of the Moon around the Earth makes the Moon look as if it is changing shape in the sky.
This is caused by the different angles from which we see the lighted part of the Moon's surface. 
Giving us the phases of the Moon. 

4. Moon Phases Duration of Cycle: 29.5 days
New Moon: the moon is between the Earth and the Sun, showing up as a dark circle
Phase in which solar eclipses occur
Waxing Crescent: waxing means that the bright side is increasing; looks like a small sliver to almost half, right side
First Quarter Moon: looks like a half circle, right side
Waxing Gibbous: more than one half is visible but it is not full

5. Moon Phases
Full Moon: the Earth is between the sun and the moon, the moon shows up as a bright circle
Phase in which lunar eclipses occur
Waning Gibbous: waning means that the bright side is decreasing; shows more than half but not quite full
Third Quarter Moon: looks like a half circle, left side
Waning Crescent: looks like a small sliver to almost half, left side
Most of the cycle happens in the waxing and waning stages

7. Tides

8. Tides
Tides are the daily rise and fall of Earth’s waters on its coastlines.
Tidal range is the difference between high and low tide
Tides occur in all bodies of water, but they are most noticeable in the ocean and large lakes.

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

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

11. 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.

12. Moon’s Gravity and Tides
The Moon’s gravity affects the water on Earth’s surface.
Since the Moon is closer to the Earth, it has a stronger gravitational pull on it than the Sun.

13. Moon’s Gravity – Tidal Bulges
The Moon pulls on the water on the side nearest to it, this pull creates a bulge of water, called a tidal bulge on the side of Earth facing the Moon.
The water on the side of Earth facing away from the Moon creates a second bulge due to the centrifugal force.

14. Tidal Bulges – High Tide
In places where there are tidal bulges, high tide is occurring.
High
Tide
High
Tide

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

16. 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.

17. 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 hours and 12 minutes.
Tidal movements can
be tracked

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

19. Spring Tides
Spring tides occur during a full and new moon when the Earth, Sun, and Moon are lined up.
Spring tides have the greatest difference between high and low tide
“strong tides”

20. 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 have the least difference between high and low tide
“weak tides”