1. Bell Ringer
The two things that affect ocean water density are ____________ and ____________.
Don’t forget you have a vocab quiz on Friday

2. Waves & Tides

3. Waves
Wave – rhythmic (regularly occurring) movement that carries energy through space or matter (here, we’re talking specifically about water)
Created by wind blowing over the water’s surface

4. Waves As a wave passes, water bobs up and down in a circular pattern
Only the energy moves forward, not the water
The water just moves in circles

5. Waves
As the water becomes shallow near the shore, the wave bottom scrapes along the sand
The bottom of the wave slows down while the top continues on

6. Waves
This causes the wave to topple over itself (break)

7. Parts of a Wave Crest – highest point of a wave
Trough – lowest point of a wave

8. Parts of a Wave
Wave Height – vertical distance between the crest and trough
Determined by wind speed, wind duration (how long it is blowing), and fetch (how much water is being blown)

9. Parts of a Wave
Wave length – the distance between two identical parts (crest  crest OR trough  trough)

10. Parts of a Wave
Wave speed – the amount of time it takes two crests or troughs to pass the same point

11. Label the Parts of the Wave

12. Tides
Tides – the periodic (happens regularly) rise and fall of sea level
Highest sea level – high tide
Lowest sea level – low tide
The daily cycle of tides is 24 hours and 50 minutes

13. Tides
The difference between high and low tides varies around the world
NC ~ 3ft
Bay of Fundy, Canada ~45ft
High Tide
Low Tide

14. Tides
Tides are caused by the gravity of the Moon and Sun pulling on the Earth
The Moon is closer to the Earth, so it affects our tides twice as much as the Sun

15. Tides
Lunar tides – tides caused by the Moon (daily high and low tides)

16. Tides Solar tides – tides caused by the Sun
Solar tides either add to or lessen the effects of the lunar tides

17. Solar Tides Spring Tides – occur when Sun and Moon line up together
Increased “pull” on the water creates a big difference between the tides
High tides are higher than normal
Low tides are lower than normal

18. Solar Tides
Neap Tides – occur when the Sun and Moon are at right angles to each other
Water is being pulled in two directions, so small difference between the tides
High tides are lower than normal
Low tides are higher than normal

19. Solar Tides Normal high & low tides spring tides neap tides
High tide line
High tide line
High tide line
Low tide line
Low tide line
Low tide line

20. Solar Tides
Solar tides alternate nearly every week

21. Other Waves
Draw something that is wavy (ex: roller coaster, wavy hair, etc.) THAT IS NOT AN OCEAN WAVE. 
This picture needs to be detailed.  If you draw wavy hair, you can’t just draw one wavy brown line.  I need to see a head, face, other hair, etc.
Title: ____ Wave (Ex: Roller Coaster Wave)
Label and define the parts of your wave: crest, trough, wave height, wave length (main part of your grade!!!!)
Turn in when done and get the Tides BYOD activity and complete

22. Other wave ideas:
Spaghetti
Cords
Staircases
Slides
Road
Slinky
Stream
Seismic waves
Snake