1
Half of the terrestrial globe, divided into northern and southern hemispheres by the equator or into eastern and western hemispheres by some meridians, usually 0° and 180°
2
The great circle of the earth with a Latitude of 0°, lying equidistant from the poles; dividing the N and S hemisphere
3
An opening in the earth\'s crust from which molten lava, rock fragments, ashes, dust, and gases are ejected from below the earth\'s surface.
4
A central or fundamental part or thing around which others are grouped; core
5
Any of a class of naturally occurring solid inorganic substances with a characteristic crystalline form and a homogeneous chemical composition
6
A thickness of some homogeneous substance, such as a stratum or a coating on a surface
7
The solid outer shell of the earth, with an average thickness of 30–35 km in continental regions and 5 km beneath the oceans, forming the upper part of the lithosphere and lying immediately above the mantle, from which it is separated by the Mohorovičić discontinuity
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