Monday, January 29, 2018 (Discussion – The Ocean in Motion: Waves; DE Techbook Assignment – Ocean Waves)

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Monday, January 29, 2018 (Discussion – The Ocean in Motion: Waves; DE Techbook Assignment – Ocean Waves)

The Launch Pad 1/1 Monday, 3/6/17 What happens to the water pressure, temperature, and light levels as you dive deeper and deeper under the sea, and why? Water pressure increases because more and more water is above you and is pressing down with its weight. Temperature and light levels decrease because there is less and less solar radiation as you go deeper.

Remediation starts today and end Friday! Announcements Remediation starts today and end Friday!

Summative or Formative # eResearch Paper - Seawater Assignment Summative or Formative # Date Issued Gone Missing Day Last Day Accepted eResearch Paper - Seawater F1 1/22 TODAY QUIZ 10 S1 1/26 Friday

Discussion - The Ocean in Motion Waves REMINDER: All slides regarding the oceans are on the class website in two separate PowerPoints: The Hydrosphere - Seawater and Currents The Hydrosphere - Waves, Tides, and Deep Ocean Exploration

Discovery Techbook Assignment Go to www.discoveryeducation.com and login. Scroll down to the bottom of your homepage and click on the “Science Techbook” link. Find the Unit titled “Studying the Hydrosphere” and click on it. Choose the Concept titled “Ocean Water.” Proceed to the third page of the Concept and scroll down to the heading titled “Ocean Waves” appears. Read and watch the videos on ocean waves. Stop when you reach the heading titled “Ocean Tides.”

The Ocean in Motion Waves

Waves Learning Objectives How are waves created and sustained? What are the major parts of a wave? What is actually moving as a wave passes? How do waves change as they approach the shore? How are tsunamis different from normal waves?

Waves Waves are created by energy traveling along the interface between ocean and atmosphere (the surface.) Waves derive their energy and motion from wind. The major parts of a wave are: the crest the trough

Wave Measurements Wave height is the distance between a trough (low point) and a crest (high point.) Wave period is the time interval for one full wave to pass a fixed position. This is also referred to as the frequency of the wave. Wavelength is the horizontal distance between successive crests (or troughs.) Wave amplitude is the height from the centerline (still water level) of a wave to its crest.

Waves Wave height, length, and period depend upon: the wind speed the length of time the wind blows

Fetch is the distance that the wind travels. Waves Fetch is the distance that the wind travels.

The waveform (energy) moves forward. Waves As the wave travels, the water passes energy along by moving in a vertical circle The waveform (energy) moves forward. At a depth of about one-half the wavelength, the movement of water particles becomes negligible (called the wave base.)

Changes That Occur When a Wave Moves Onto Shore Figure 15.14

Tsunamis Unlike regular waves that draw their energy from air movement, tsunamis are caused by violent undersea earthquakes. Tsunamis are among the most destructive forces on earth – they can cause hundreds of thousands of deaths and untold property damage.

Waves Summary How are waves created and sustained? … by energy traveling along the interface between ocean and atmosphere (the surface.) Waves derive their energy, motion, and sustainability from wind.

What are the major parts of a wave? Waves Summary What are the major parts of a wave? the crest, trough, wave height, wave length, wave period, amplitude, wave base

Waves What is actually moving as a wave passes? Summary What is actually moving as a wave passes? The water passes energy along by moving in a vertical circle. The waveform (energy) moves forward.

How do waves change as they approach the shore? Summary How do waves change as they approach the shore? When the wave base touches the ocean floor, the base moves more slowly than the crests, causing the wave to topple over forward, or “break.”

How are tsunamis different from normal waves? Summary How are tsunamis different from normal waves? Tsunamis draw their energy from violent undersea earthquakes, whereas regular waves draw their energy from air movement (wind.)