Cavities in the Earths surface, resultant of collisions between an asteroid or meteorite
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Category: <span>I</span>
A common ore of titanium
The simplest of the 3 main rock types which includes sedimentary and metamorphic, igneous rocks are formed immediately upon the cooling of molten material
Minerals whose colour is influenced by their primary constituent
A fossil used to determine the surrounding rock based on the likely time of its origin
A fragment of other rock contained or enclosed within a host rock
A structure not vertical, usually dipping
When a substance is caused to ignite a spark or flame, through chemical or mechanical reaction
Where 2 or more lines meet or cut across each other
A substance that emits light when heated