Earth

=== Internal structure ===
{{Main|Internal structure of Earth}}

{| class="wikitable sortable" style="float: right; clear: right; margin-left: 2em; text-align:center;"
|+Geologic layers of Earth<ref name=pnas76_9_4192>{{cite journal |last1=Jordan |first1=T. H. |title=Structural geology of the Earth's interior |journal=Proceedings of the National Academy of Sciences of the United States of America |year=1979 |volume=76 |issue=9 |pages=4192–4200 |doi=10.1073/pnas.76.9.4192 |pmid=16592703 |pmc=411539 |bibcode=1979PNAS...76.4192J|doi-access=free }}</ref>
| colspan="3" style="font-size:smaller; text-align:center;" |[[File:Earth-cutaway-schematic-english.svg|center|frameless]]Illustration of Earth's cutaway, not to scale
|-
!Depth<span style="font-size: smaller;"><ref name=robertson2001>{{cite web |last1=Robertson |first1=Eugene C. |date=26 July 2001 |url=http://pubs.usgs.gov/gip/interior/ |title=The Interior of the Earth |publisher=USGS |access-date=24 March 2007}}</ref><br />(km)</span>
! Component <br />layer name
!Density<br /><span style="font-size: smaller;">(g/cm<sup>3</sup>)</span>
|-
|0–60
| style="text-align:left;" |[[Earth's lithosphere|Lithosphere]]<ref group="n">Locally varies between {{val|5|and|200|u=km}}.</ref>
|—
|-
|0–35
| style="text-align:left;" |[[Earth's crust|Crust]]<ref group="n">Locally varies between {{val|5|and|70|u=km}}.</ref>
|2.2–2.9
|-
|35–660
| style="text-align:left;" |[[Upper mantle (Earth)|Upper mantle]]
|3.4–4.4
|-
|660–2890
| style="text-align:left;" |[[Lower mantle (Earth)|Lower mantle]]
|3.4–5.6
|-
|100–700
| style="text-align:left;" |[[Asthenosphere]]
|—
|-
|2890–5100
| style="text-align:left;" |[[Earth's outer core|Outer core]]
|9.9–12.2
|-
|5100–6378
| style="text-align:left;" |[[Earth's inner core|Inner core]]
|12.8–13.1
|}

Earth's interior, like that of the other terrestrial planets, is divided into layers by their [[chemical]] or physical ([[Rheology|rheological]]) properties. The outer layer is a chemically distinct [[Silicate minerals|silicate]] solid crust, which is underlain by a highly [[viscous]] solid mantle. The crust is separated from the mantle by the [[Mohorovičić discontinuity]].<ref name="GeolSoc" /> The thickness of the crust varies from about {{convert|6|km|mi|sp=us}} under the oceans to {{convert|30|-|50|km|mi|abbr=on}} for the continents. The crust and the cold, rigid, top of the [[upper mantle]] are collectively known as the lithosphere, which is divided into independently moving tectonic plates.<ref>{{cite news|url=https://education.nationalgeographic.org/resource/lithosphere/|title=Lithosphere|work=[[National Geographic]]|last1=Micalizio|first1=Caryl-Sue|last2=Evers|first2=Jeannie|date=20 May 2015|access-date=13 October 2020}}</ref>

Beneath the lithosphere is the [[asthenosphere]], a relatively low-viscosity layer on which the lithosphere rides. Important changes in crystal structure within the mantle occur at {{convert|410|and|660|km|mi|abbr=on}} below the surface, spanning a [[Transition zone (Earth)|transition zone]] that separates the upper and lower mantle. Beneath the mantle, an extremely low viscosity liquid [[outer core]] lies above a solid [[Earth's inner core|inner core]].<ref name=tanimoto_ahrens1995 /> Earth's inner core may be rotating at a slightly higher [[angular velocity]] than the remainder of the planet, advancing by 0.1–0.5° per year, although both somewhat higher and much lower rates have also been proposed.<ref name="Deuss_2014" /> The radius of the inner core is about one-fifth of that of Earth.
{{anchor|Density}}Density increases with depth, as described in the table on the right.

Among the Solar System's planetary-sized objects Earth is the [[List of solar system objects by size|object with the highest density]].