SCIENCE

DECEMBER 4, 2015

WARM UP

• Bring your notebook, pencil, and agenda to your desk

• Grab the weekly warm up from the front table

• Complete Thursday’s warm up now• YOU ARE QUIET, WORKING WHEN

THE BELL RINGS

Agenda Today!• Beacon Assessment for Science • This will assess your knowledge of the science

concepts covered so far this year • The test is 35 questions• You will record your answers on a bubble sheet

and bring your work to me when completed• Afterwards you will work independently on a

chromebook for today’s lesson

Independent Work

• You will work on a chromebook during the remaining time in class today to take notes and read information related to the Ozone Layer, UV radiation and skin cancer

Please label the next available page in your notebook THE

OZONE LAYER

What is it?Where is it?

Why is it important to life on Earth?How are we as humans affecting it?

Write these notes in your Write these notes in your notebooknotebook

The ozone layer is a The ozone layer is a layer of gas consisting layer of gas consisting of Oof O33 molecules, molecules,

The ozone layer is a The ozone layer is a protective layer of gas protective layer of gas molecules located molecules located within the stratosphere.within the stratosphere.

It blocks harmful UV It blocks harmful UV radiationradiation

Read about OzoneRead about Ozone

Ozone is a molecule Ozone is a molecule consisting of oxygen consisting of oxygen atoms.atoms.

Ozone gas can be Ozone gas can be created or destroyed created or destroyed by the sun’s by the sun’s UltraViolet rays as UltraViolet rays as shown in the picture shown in the picture to the right.to the right.

Read: Where is the ozone Read: Where is the ozone layer?layer?

Ozone gas also exists Ozone gas also exists in the troposphere and in the troposphere and at ground level, but at ground level, but most is located within most is located within the stratospheric layer the stratospheric layer shown to the right.shown to the right.

Read: Why is it important to life Read: Why is it important to life on Earth?on Earth?

On a daily basis, the sun radiates its energy toward On a daily basis, the sun radiates its energy toward Earth. One form of this energy is Ultraviolet radiation, Earth. One form of this energy is Ultraviolet radiation, also known as UV rays.also known as UV rays.

UV rays are relatively high energy waves that provide UV rays are relatively high energy waves that provide Earth with the warmth it needs to support life as we Earth with the warmth it needs to support life as we know it.know it.

Read: Ultra-Violet RadiationRead: Ultra-Violet Radiation

UV rays penetrate UV rays penetrate the Earth’s the Earth’s atmosphere at 3 atmosphere at 3 slightly different slightly different wavelengths called wavelengths called UV-A, UV-B, and UV-A, UV-B, and UV-C rays.UV-C rays.

Read: So, why is the ozone layer Read: So, why is the ozone layer important to life on Earth?important to life on Earth?

The stratospheric ozone The stratospheric ozone layer completely stops layer completely stops the penetration of UV-C the penetration of UV-C rays and eliminates rays and eliminates most of the UV-B rays.most of the UV-B rays.

Therefore, the ozone Therefore, the ozone layer protects life on layer protects life on Earth from the harmful Earth from the harmful effects of solar radiation effects of solar radiation on a daily basis.on a daily basis.

So what might life be like without So what might life be like without the ozone layer?the ozone layer?

So what about the hole in the So what about the hole in the ozone layer? Compare 1979 vs. ozone layer? Compare 1979 vs.

20072007

October 1979 October 2007

The Ozone HoleThe Ozone Hole

Since the 1970’s the ozone hole has Since the 1970’s the ozone hole has been increasing in size over the been increasing in size over the Antarctic.Antarctic.

For the first time, in September of 2000, For the first time, in September of 2000, the ozone hole became so large it the ozone hole became so large it actually left populated areas of southern actually left populated areas of southern Chile fully exposed to the effects of the Chile fully exposed to the effects of the Sun’s UV rays.Sun’s UV rays.

Chile’s Ozone Hole(S. Hemisphere) Chile’s Ozone Hole(S. Hemisphere)

Read: How does ozone Read: How does ozone depletion affect global warming depletion affect global warming and ultimately climate change?and ultimately climate change?

As ozone levels in the stratosphere are As ozone levels in the stratosphere are depleted, more solar radiation penetrates the depleted, more solar radiation penetrates the Earth’s atmosphere.Earth’s atmosphere.

This affect results in an increase in solar This affect results in an increase in solar radiation reaching the Earth’s surface adding radiation reaching the Earth’s surface adding to an increase in surface temperature.to an increase in surface temperature.

In turn, global warming actually results in a In turn, global warming actually results in a warming of the troposphere, but a cooling of warming of the troposphere, but a cooling of the stratosphere, hindering the ozone layer’s the stratosphere, hindering the ozone layer’s natural chemistry for repairs.natural chemistry for repairs.

Article on Ultraviolet Rays and Article on Ultraviolet Rays and Skin Cancer Skin Cancer

On your next available page please label the On your next available page please label the page Ultraviolet Rays and Skin Cancer Articlepage Ultraviolet Rays and Skin Cancer Article

You will access 2 resources on the wiki page:You will access 2 resources on the wiki page: 1 The Article on Skin Cancer1 The Article on Skin Cancer 2. Directions and questions for the article 2. Directions and questions for the article You must answer the questions in your You must answer the questions in your

notebooknotebook