Name: ___________________________________________________________________ Period: _______ Ozone Layer Packet - Advanced
Component → 8.2.2
Guiding Questions ​(questions you should be able to answer by the end of this packet before taking the test!) 1.
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What are the three types of UV radiations and which ones hit Earth? Why does UV radiation vary and what does it depend on? What are the pros of UV radiation? What are the negative effects of UV radiation on humans and plants? Agenda ​(fill in the squares and circles as you complete everything on the agenda) Ozone Song→ ​5​ Minutes →​ Page 2 ○ Watch the video and fill in responses. UV Bead Lab →​
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40 Minutes
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→​ Pages 3­5 ○ Collect materials from your teacher and complete the activity. Ozone Note Video → ​10 Minutes →
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Pages 6­7 ○ Watch the Ozone Note Video while following along on the notes page. ○ Using the information that you learned in the notes video and go back to verify your answers from the the UV Lab. UV and Ozone Drawing → ​20 Minutes → Page 8 ○ Using what you learned, complete the drawing and questions. ○ Show your science teacher your packet! 4 Square Worksheet → ​20 Minutes → Page 9 ○ Complete the grid with thoughtful answers Guiding Questions →​ 5 minutes → Page 10 Quiz → ​
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10 Minutes → Fill in the date of your quiz​
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____________________ ○ Show your science teacher your packet! ○ Ozone Layer Quiz ○ Give your correct quiz to your teacher. 70% or Above ● Move on to the Greenhouse Packet ●
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69% or Under Correct the quiz Highlight and study your notes Ask any questions you might have Retake the Ozone quiz Unit Test will cover 5 packets: EMS, Layers of the Atmosphere, Ozone, Greenhouse, and Global Warming 1 Name: ___________________________________________________________________ Period: _______ Ozone Song Video While you are watching the video, take notes. You should have at least 5 bullet points of information you learned. Press pause during the video to record observations on your paper.
● ● ● ● ● 2 Name: ___________________________________________________________________ Period: _______ Ultraviolet Radiation Bead Lab Purpose: We all need exposure to the sun, as it is our primary source of vitamin D. But it does not take much time in the Sun for most people to get the needed amount of vitamin D. When we stay in the Sun for periods of time without skin protection the Sun’s ultraviolet rays can cause minor to major damage. Damages from the Sun can be skin damage, sun poisoning, eye damage, immune systems suppression, and in some cases even cancer. It is not uncommon for people living in Florida who are less than 30 years of age, to have developed skin cancer. The Sun also weakens the skin’s elasticity leading to premature aging, early wrinkles, and a tough leathery look. Over exposure also leads to the development of flat, scaly, reddish patches called Solar Keratoses, which sometimes are precancerous. The most serious consequence of over exposure to the Sun is skin cancer. Over 700,000 new cases of this most common form of cancer occur each year. No tan is a safe tan! Not all sunlight is “equal” in UV concentration. The intensity of the Sun’s rays depends upon the time of year, as well as the altitude and latitude of your location. UV rays are strongest during summer. Remember that the timing of this season varies by location. Extra protection is also required near the equator, where the Sun is strongest, and at high altitudes, where the air and cloud cover are thinner, allowing more damaging UV rays to get through the atmosphere. Even during the winter months, if you family goes skiing in the mountains, be sure to apply plenty of sunscreen; UV rays reflect off both snow and water, increasing the probability of sunburn. Even on cloudy, cool or overcast days, UV rays travel through the clouds and reflect off sand, water and even concrete. Clouds and pollution don’t filter out UV rays, and they can give a false sense of protection. This “invisible sun” can cause unexpected sunburn and skin damage. Often people are unaware that they are developing sunburn on cooler or windy days because the temperature or breeze keeps their skin feeling cool on the surface. The beads you will be using are special since they change color when they are exposed to different kinds of light. What causes the change? Humidity? Temperature? Fresh air? Birds flying overhead? Procedure: 1. READ THE PURPOSE PARAGRAPHS 2. Verify that you have the following at your lab station: ○ Bag 1­3 = No sunscreen ○ Bag 4 = 4 SPF Normal Sunscreen ○ Bag 5 = 15 SPF Normal Sunscreen ○ Bag 6 = 55 SPF Normal Sunscreen ○ 1 medicine bottle with beads inside (DO NOT REMOVE!) ○ Sunglass lense ○ Fabric 3. DO NOT REMOVE BEADS from the plastic bags or medicine bottle. 4. Take the sunglass lense, medicine bottle, bag #1 (control) and fabric to one of the window stations. 5. Compare the bag #1 with those bags on the window (bags #4, 5, & 6) 6. Take bag 2 and place one of the sunglass lenses on the bag to completely cover the bead. 3 Name: ___________________________________________________________________ Period: _______ 7.
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Take the fabric and cover the bead in bag 3. Let the beads stay there for 5 minutes Observe each bead. Rate each bead on a scale of 1­5. ○ 5 showing the most color or “burning” ○ 1 showing the least color 11. Collect ALL the materials and return them to your lab station. Bag # Protection Rating 1 None 2 Sunglass lense 3 Fabric 4 SPF 4 5 SPF 15 6 SPF 55 7 Medicine bottle Bag #1 Black Light Medicine Bottle Black Light Analysis Questions: 1. When thinking back to the scientific method, what does the bead in bag #1 represent? 2. Why did the beads change color? 3. Which beads absorbed the most UV Radiation? (Turned the darkest color) 4. Which beads absorbed the least UV Radiation? (Didn’t change color) 5. Which type of sunscreen is the best? 6. What experimental errors could have occurred to cause your results to differ from what you normally expect? 4 Name: ___________________________________________________________________ Period: _______ 7. Why do you think it is important to wear sunscreen? 8. Why are you supposed to reapply sunscreen? 9. Besides skin cancer, why should people try to avoid too much UV radiation? Be specific. 10. Why do you think that doctors say to wear sunscreen at the beach even if you plan to stay under a beach umbrella? 11. What happened to the bead in the medicine bottle? 12. Medicine bottles are commonly colored red or orange. Why do you think the manufacturer does this? 5 Name: ___________________________________________________________________ Period: _______ Ozone Layer and Ultraviolet Radiation Notes Can you get sunburned in the winter? Can you get sunburned when it is overcast and cloudy? 3 Types of UV Radiation ● UV A ○ Not absorbed by the ozone ○ Hits the earth 100% of the time ● UV B ○ Can be absorbed/blocked by Ozone Layer. ○ Not 100% ● UV C ○ Completed absorbed by the ozone layer ○ 0% hits the earth UV Levels vary based on time of day, time of year, latitude and altitude ● More direct sunlight = ​more UV radiation ● Can you get sunburned in the winter ○ YES! → Ultraviolet rays are still hitting earth. ● Can you get sunburned when it is cloudy / overcast? ○ YES! → UV Radiation still hits the earth ○ Clouds only protect us from a small amount of UV Benefits of UV Radiation ●
Provides Vitamin D Negative Effects of UV Radiation ● Sun Tan ● Sunburn ● Skin Cancer ● Cataracts ● Weakened immune system ● Harms humans and animals ● Hurts plants ○ Reduced photosynthesis ■ Lower growth rates ■ Less production ● Hurts the reproductive cycle of phytoplankton ○ Hurts the populations of other animals ​­​ Food Web interruption 6 Name: ___________________________________________________________________ Period: _______ Ozone Layer Protects us ● The ozone layer is found in the Stratosphere ○ 90% of ozone is in the stratosphere ○ Ozone Layer is 9.3 to 18.6 miles above the earth ■ It would take 9 minutes to 17 minutes to drive there ● YMS to YHS Ozone Molecules ● 3 Oxygen Atoms bonded together ● O​3 Chlorofluorocarbons (CFC’s) break down ozone ● UV rays break them down into chlorine, Fluorine and Carbon ○ One atom of chlorine can destroy more than a hundred ozone molecules CFC’s were found in aerosols, cleaning products, refrigerators, air conditioners, foam products, and sterilization systems ● CFC’s were banned in 1996 because our Ozone Layer was becoming thin (many people called it a hole) ○ Amount of chlorine in the atmosphere is now falling ○ By 2050 our ozone layer should be close to its natural amount (Slowly healing itself) ●
Suggestions to avoid UV and to protect yourself ● Avoid the sun! ● Use sunscreen ● Wear sunglasses ● Cover UP ● Seek Shade ● Be careful near water, snow and sand ○ Snow, sand, pavement and water also reflect UV Radiation and can cause you to get burned 7 Name: ___________________________________________________________________ Period: _______ Ozone Drawing 1. In the space below draw the three types of UV radiation coming from the sun into our atmosphere ○ Make sure you include the following in your drawing. You are welcome to use color pencils/markers. ■ The Sun ■ The Earth ■ The Ozone Layer ■ UVA (​include percent​ of rays that get to the surface of the Earth) ■ UVB ​(​include percent​ of rays that get to the surface of the Earth) ■ UVC (​include percent​ of rays that get to the surface of the Earth) 1. How would your drawing above change if we had additional ozone in the ozone layer? 2. How would your drawing above change if we had less ozone in the ozone layer? 3. Why is UV radiation necessary? 4. What are 5 negative effects of too much UV radiation? 8 Name: ___________________________________________________________________ Period: _______ What are CFC’s and where are they found? Imagine a world without the Montreal Protocol. Explain how the world would be different. Be specific How are each of the types of UV radiation similar and different? Draw a world where people understood UV radiation and its negative effects. 9 Name: ___________________________________________________________________ Period: _______ Guiding Questions
1. What are the three types of UV radiations and which ones hit Earth? 2. Why does UV radiation vary and what does it depend on? 3. What are the pros of UV radiation? 4. What are the negative effects of UV radiation on humans and plants? 5. What are CFC’s and what role do they play on the Ozone Layers history? STUDY FOR YOUR QUIZ!
Take home your packet and review your
notes.
Make flashcards to help you study!
Have someone quiz you over the notes!
Be prepared the first time!
See your teacher tomorrow to take
the quiz!
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