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Related Concept Videos

Global Climate Change01:50

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units and sand dry and...

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Related Experiment Video

Updated: Jul 6, 2026

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
07:58

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt

Published on: August 7, 2017

Predicting eruptions at mount st. Helens, june 1980 through december 1982.

D A Swanson, T J Casadevall, D Dzurisin

    Science (New York, N.Y.)
    |September 30, 1983
    PubMed
    Summary

    Mount St. Helens eruptions were predicted hours to weeks in advance using seismicity and ground deformation. This volcanic eruption prediction capability enhanced safety and informed land-use planning.

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    Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
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    Area of Science:

    • Geology
    • Volcanology
    • Seismology

    Background:

    • Mount St. Helens experienced numerous eruptions between 1980 and 1982.
    • Predicting volcanic activity is crucial for public safety and resource management.

    Purpose of the Study:

    • To analyze the effectiveness of prediction methods for Mount St. Helens eruptions.
    • To assess the lead time and precursors associated with volcanic events.

    Main Methods:

    • Monitoring precursory seismicity (earthquake activity).
    • Tracking ground deformation of the crater floor and lava dome.
    • Analyzing gas emissions.

    Main Results:

    • Thirteen eruptions were predicted between 1980 and 1982.
    • Initial predictions were hours in advance; later predictions ranged from 3 days to 3 weeks.
    • Seismicity, dome deformation, and gas emissions were key indicators.

    Conclusions:

    • Volcanic eruption prediction is feasible using multiple monitoring techniques.
    • Improved prediction capabilities significantly reduce risks to life and property.
    • Prediction data can guide land-use planning in hazardous volcanic areas.