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Related Concept Videos

Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
Precipitation Gravimetry01:03

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Green Algae01:21

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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.

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Related Experiment Video

Updated: Jul 12, 2026

Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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Unusual radar echoes from the greenland ice sheet.

E J Rignot, S J Ostro, J J van Zyl

    Science (New York, N.Y.)
    |September 24, 1993
    PubMed
    Summary

    Airborne radar reveals Greenland

    Area of Science:

    • Planetary Science
    • Glaciology
    • Remote Sensing

    Background:

    • Radar imaging is crucial for studying planetary surfaces.
    • Terrestrial icy environments and outer solar system bodies can exhibit similar radar signatures.
    • Understanding these similarities aids in remote sensing interpretations.

    Purpose of the Study:

    • To compare radar properties of Greenland's icy terrain with Jupiter's Galilean satellites.
    • To investigate the unique radar echoes from the Greenland percolation zone.
    • To analyze anomalous polarization ratios in radar signals.

    Main Methods:

    • Airborne radar imaging of the Greenland ice sheet.
    • Analysis of radar echoes at 5.6 and 24 cm wavelengths.
    • Comparison with existing radar data from icy satellites (3.5 and 13 cm wavelengths).

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    Simulating Impacts of Ice Storms on Forest Ecosystems
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    Simulating Impacts of Ice Storms on Forest Ecosystems
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    Simulating Impacts of Ice Storms on Forest Ecosystems

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    Main Results:

    • Greenland's icy terrain exhibits unique radar properties compared to other terrestrial surfaces.
    • Radar echoes from Greenland are intensely strong, similar to those from icy Galilean satellites.
    • Anomalous circular and linear polarization ratios were observed in both Greenland and Galilean satellite radar echoes.

    Conclusions:

    • The radar properties of Greenland's percolation zone share similarities with Jupiter's icy moons.
    • Subsurface heterogeneity differs significantly due to distinct formation processes (melting/refreezing vs. meteoroid bombardment).
    • Radar remote sensing provides insights into diverse icy environments across the solar system.