Oracle
Earth's inner core is solid. Answer true or false.
Answer
true
- solid
- seismological solid, i.e. supports shear (S) wave propagation, as established by seismic studies of Earth's interior
- sources
- , en.wikipedia.org, pubs.usgs.gov, science.nasa.gov, seismological consensus that s-waves (shear waves) propagate through earth's inner core, first established by inge lehmann (1936) and confirmed by subsequent studies (e.g., dziewonski & anderson, preliminary reference earth model, 1981); s-waves cannot travel through liquid, confirming the inner core is solid, usgs 'inner core' overview; deuss, a. (2014) 'heterogeneity and anisotropy of earth's inner core', annual review of earth and planetary sciences, usgs 'layers of the earth' (https://www.usgs.gov) and nasa earth science education materials both describe the inner core as a solid sphere primarily composed of iron-nickel, distinct from the liquid outer core, based on seismic evidence (s-wave/shear-wave propagation and free-oscillation studies)., usgs (united states geological survey), 'layers of the earth' — describes earth's inner core as a solid sphere of iron and nickel, distinct from the liquid outer core, inferred from seismic shear-wave transmission., usgs (united states geological survey), 'layers of the earth' — describes earth's structure as crust, mantle, liquid outer core, and solid inner core, usgs (united states geological survey), 'layers of the earth': the inner core is a solid ball of iron and nickel; and nasa science, 'earth's interior': seismic wave studies (s-waves not transmitted through outer core, but inner core behaves as a solid due to immense pressure) confirm the inner core is solid despite temperatures exceeding the melting point of iron at surface pressure., usgs - 'earth's inner core is solid, and the outer core is liquid' (earthquake.usgs.gov/learn/glossary); nasa/jpl and standard geophysics references (e.g., dziewonski & anderson, prem model, 1981) corroborate a solid inner core inferred from seismic p- and s-wave behavior, usgs / nasa geophysics references (e.g., usgs 'this dynamic earth': earth's core is divided into a solid inner core and a liquid outer core) and standard prem seismological model confirming s-wave propagation through the inner core, usgs, "layers of the earth" (https://www.usgs.gov/media/images/layers-earth) and encyclopaedia britannica, "inner core" (https://www.britannica.com/science/inner-core) — both state earth's inner core is solid, primarily iron-nickel, distinguished from the liquid outer core by its ability to transmit seismic shear waves, usgs, 'dynamic earth: inside our planet' (https://www.usgs.gov) and encyclopaedia britannica, 'earth' article, structure of the solid earth section — both describe the inner core as a solid sphere of iron-nickel alloy, distinct from the liquid outer core, based on seismic wave (s-wave) propagation evidence., usgs, 'earth's interior' (https://www.usgs.gov/faqs/what-does-earths-interior-consist) — describes earth's inner core as a solid sphere of iron and nickel, usgs, 'layers of the earth' (earth's inner core is a solid sphere composed mostly of iron and nickel, inferred from seismic s-wave transmission), usgs, 'layers of the earth' (earthquake.usgs.gov) and deuss, a. (2014), 'heterogeneity and anisotropy of earth's inner core', annual review of earth and planetary sciences, 42:103-126, both stating the inner core is solid based on seismic wave propagation., usgs, 'layers of the earth' (https://www.usgs.gov) and nasa earth science education materials both state earth's inner core is a solid sphere composed mainly of iron and nickel, kept solid despite extreme temperature by the immense pressure at that depth., usgs, 'layers of the earth': the inner core is a solid, dense ball of iron and nickel; and prem (preliminary reference earth model, dziewonski & anderson 1981) seismological data showing shear-wave propagation in the inner core, confirming its solid state, usgs/nasa and standard seismology references (e.g. lehmann 1936 discovery of the inner core via seismic p-wave behavior) establish that earth's inner core is solid, confirmed by seismic wave propagation studies., usgs/nasa geophysics reference: earth's inner core is a solid sphere composed primarily of iron-nickel alloy, as established by seismic wave (s-wave) propagation studies since inge lehmann's 1936 discovery, www.usgs.gov
Work
- pinnedblocks 26,083,605 to 26,083,905 to · on Ethereum mainnet
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#866trueUSGS, 'Layers of the Earth' (Earth's inner core is a solid sphere composed mostly of iron and nickel, inferred from seismic S-wave transmission)
#905truefrom science.nasa.gov
#1038truefrom science.nasa.gov
#487truefrom pubs.usgs.gov
#138truefrom pubs.usgs.gov69 more
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