Where 2 or more lines meet or cut across each other
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Category: <span>I</span>
A substance that emits light when heated
Used to describe an area between mountains
Rock lacking porousness
A form of the same element containing a different number of neutrons in its nucleus, giving that element characteristic properties and atomic weight
A change of state occurring at a fixed temperature
Folding sufficient to bring the limbs in parallel
Radiation that ionizes matter, rather than passing through it or reflecting from it
An exchange of ions between two electrolytes or, between an electrolytic solution and another complex, a process used in the aqueous separation of minerals
Electrically charged particles missing one or more electrons than an atom