Term used to describe a radioisotopes decay to 50% of its current energy
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Tag: <span>H</span>
Said of rocks with a jagged or fractured surface
Consisting of not one but various elements
A geologic process occurring inside or below the Earths crust
Exactly half of a sphere
A substance containing water
An common oxide of iron, and form of iron ore, which takes a high polish and is frequently in gemstones and jewelry
A prefix describing a glassy characteristic
A group of metals from copper to bismuth on the periodic table of elements, or any element with a specific gravity of 4 or more
The movement of thermal fluid bodies within the Earths crust