Inner and Outer Core
The outer core is composed of liquid iron and nickel, mostly.
the two parts of the core are the inner core and the outer core
All galaxies have a dense core of stars. Spiral galaxies, however, have arms that are often visible. There are two kinds of spiral galaxies: barred, where there appears to be a line running from arm to arm through the core, and ordinary, where there is no bar.
there are two kinds in every person.
The Two kinds of Solution are:SolventSolute
only 1 crust. then the lithosphere, upper mantle, lower mantle, outer core, inner core.
The two layers of the Earth's core are the outer core and the inner core. The outer core is composed primarily of molten iron and nickel, while the inner core is solid due to the immense pressure at the center of the Earth.
Ice and dust.
Two kinds of daughters: obedient and disobedient
Two kinds of marrow are red and yellow.
The two kinds of Arthropods are the Crustaceans and Arachnids.
some kinds of seismic waves cannot travel through liquids, such as the outer core.