### energy | radiation:

Ultraviolet radiation
* Most ultraviolet radiation causes cancer
  - skin cancer
  - has power
  - reaches surfaces
* Some ultraviolet radiation affects layers
  - ozone layers
  - causes sunburns
  - depends on properties
  - hits surfaces
  - produces compounds
  - requires for gases
* breaks the water molecules into less massive particles that can escape.
* can alter the chemical structure of DNA by causing new covalent bonds to form
  - break chemical bonds and cause undesirable changes in optical properties
  - burn the skin and cause skin cancer
* can cause mutations, cancer, and cataracts
  - skin cancer and cataracts
  - white zircon to revert to brown
  - kill living things
  - eye damage and skin cancer
* causes skin cancer and damages plants and wildlife
  - cancer, cataracts and increased susceptibility to diseases
  - cells to undergo uncontrolled mitotic division
* comes from sunlight, which contains three forms of radiation.
* damages the eye's lens and retina
  - skin , eyes and eggs of amphibians
* emerging from the central source excites nearby gas causing it to glow.
* enables chemical species to be photolyzed.
* exposes the chromium salt and forms a very weak image.
* falls under three categories separated by wavelength.
* increases the risk of developing cataracts.
* is absorbed by ozone and oxygen in the upper atmosphere.
* is also a threat at high elevations
  - greater at high altitudes and closer to the equator
  - invisible
  - another form of radiation used in exploring outer space
  - dangerous because it can cause cancer
  - energetic enough to affect the electronic states of molecules
  - greatest on cloudless days
  - highest at the equator
* is known to affect the immunological defenses of the skin
  - cause skin cancer and has damaging effects on plants and wildlife
  - one form of radiant energy coming from the sun
  - present in the sun's rays throughout the year
  - rather a common method in Norway for disinfection of drinking water
  - related with hot objects
  - scattered even more by the atmosphere
  - the most common form of energy for most photochemical reactions
* is used in several food processes to kill unwanted microorganisms
  - to expose the image
* is very damaging to polyester fabric
  - useful in astronomy
* kills bacteria and viruses.
* penetrates skin.
* stimulates the enzyme that makes melanin.
* well-known modulator of immune responses in the skin
  - mutagen
+ Amphibian, Conservation: Amphibians
  * The amphibian population have been decreasing from all locations in the world. Scientists have said that the declining of amphibians is one of the most critical threats to global biodiversity. A number of causes are believed to be involved. These include habitat destruction, over-exploitation, pollution, introduced species, climate change, destruction of the ozone layer, and diseases like chytridiomycosis. Ultraviolet radiation damages the skin, eyes and eggs of amphibians. However, the declines of amphibian population are still not understood.

Visible radiation
* drives the light reactions.
* gives valuable information about physical properties.
* is associated with energy that can cause chemical reactions to occur