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=Welcome to 9 Science 1 Wiki.=

The purpose of this Wiki is to enable the DER to evolve in our classroom. Each student will be required to complete a number of tasks that appear on this "Home Page" in their own individual page within the Wiki.



=__**Tasks:**__=

Global Warming


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[|Wikipedia - Global warming] [|Allianz - Global warming] [|Think Quest - Global warming]

1. **The Greenhouse Effect**
 * Describe how the green house effect operates and compare it to a car left with windows up in summer.

2. **The enhanced greenhouse effect**
 * Contrast the greenhouse and enhanced greenhouse effect.

**3. Greenhouse gases: where do they come from?**
 * Describe the history of the rise in greenhouse gases.
 * Explain that the main gas is carbon dioxide but others also contribute.


 * 4. Evidence in the ice**
 * Describe how the graphs have been drawn back 420 000 years.

**5. The future**
 * Examine what may happen to world surface temperatures and sea level. Use the detailed predictions to examine local effects.


 * 6. El Niño**
 * Define the El Niño effect.

The Ozone Layer


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**1. What is ozone?**
 * Describe ozone as a form of oxygen. List its properties.


 * 2. The ozone layer**
 * Describe how ozone is formed and how it is distributed in the atmosphere.
 * Complete QT video – Stratospheric ozone


 * 3. Chlorofluorocarbons**
 * Describe the history and uses of CFCs.
 * Present different ozone-depleting gases and their origins.
 * State their average life in the atmosphere.


 * 4. The hole story**
 * Define a Dobson unit and relate this to ozone thickness.
 * Present the history of the hole in the ozone layer over Antarctica.
 * Discuss its effect on Australia and New Zealand.


 * 5. The future**
 * Research the Montreal Protocol and its expected effect on the ozone layer.

Nuclear radiation: good or evil? []
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1. **Radiation and radioactivity**
 * Define what occurs when a radioactive element’s nucleus breaks apart.


 * 2. Atoms and isotopes**
 * Define an isotope as atoms of the same element with different numbers of neutrons in the nucleus.
 * Describe the isotopes of hydrogen.


 * 3. Three types of nuclear radiation**
 * Describe the three main types of radioactive decay – alpha, beta and gamma radiation.


 * 4. Half-life**
 * Define the half-life of various isotopes.


 * 5. Sources of nuclear radiation**
 * Describe both natural and artificial sources of radiation.


 * 6. Effects of radiation**
 * Describe the biological effects of excess nuclear radiation. Describe how radiation is measured and the units used.


 * 7. Uses of nuclear radiation**
 * Research various uses for nuclear radiation including nuclear medicine, industrial applications, and carbon dating.

Energy crisis
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1. **Generating nuclear energy**
 * Define and describe the process of fission, include chain reactions.


 * 2. Nuclear reactors**
 * Describe a nuclear reactor as being a controlled nuclear bomb.
 * Discuss the main components of a nuclear reactor.

**3. Nuclear dangers**
 * Investigate the dangers associated with using nuclear energy.
 * Describe in detail the Chernobyl disaster and the after-effects.
 * Investigate the two sides of using nuclear energy.


 * 4. Alternative energy sources**
 * Define the process of fusion and the associated problems

Summary
Create a wordle to summarise the unit.