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General

Earth ellipsoid
Ellipsoid of rotation that approximates the figure of the Earth
Earth's inner core
Innermost part of Earth, a solid ball of iron-nickel alloy
Earth's outer core
Fluid layer composed of mostly iron and nickel between Earth's solid inner core and its mantle
Equatorial bulge
Outward bulge around a planet's equator due to its rotation
Figure of the Earth
Size and shape used to model the Earth for geodesy
Flat Earth
Archaic conception of Earth's shape as a plane or disk
Geological hazard
Geological state that may lead to widespread damage or risk
Internal structure of Earth
Inner structure of planet Earth, consisting of several concentric spherical layers
Mantle (geology)
Part of the interior of the planet Earth
Mohorovičić discontinuity
Boundary between the Earth's crust and the mantle
Natural disaster
Type of adverse event
Natural resource
Resources that exist without actions of humankind
Spherical Earth
Approximation of the figure of the Earth as a sphere