Once a volcano erupts, gases are emitted and released into the atmosphere. During large eruptions, gases have actually caused global climate change. In other systems, gases are emitted continuously into the atmosphere from soils, volcanic vents, fumaroles and hydrothermal deposits.he spectrometer is designed to measure the concentration of sulfur dioxide (SO2) in the volcanic plume that is emitted from the volcano. The device requires a standard, from which to analyze the ultraviolet light absorbed by the SO2 molecules in the plume.
Once you've done that, shred the paper documents (to avoid ID theft) or securely trash electronic files unless you need them to support your tax return. Keep insurance policies and investment statements until new ones arrive. Keep for a year or more. You'll want to hold onto loan documents until the loan is paid off.
WHAT TO KEEP. The most important documents to hang on to are your annual tax returns. You should keep the actual returns forever, but you can get rid of the supporting documents after three years. That's how long the IRS has to initiate an audit.Once the time elapses, toss the records -- and shred any that reveal your Social Security number or other personal information.nother reason to keep these papers: If you sell your house at a hefty profit (more than $500,000 for couples filing a joint return or $250,000 for single filers), certain expenses can be used to lower your tax bill. After you sell the house, keep the documents for three years.