Timbers laid at right angles to each other to create a vertical or horizontal support structure
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Category: <span>C</span>
A wide crack, fissure or opening in rock
A period existing 146-65 million years ago
A stabilized part of the Earth’s crust, usually centrally attached to the continents
A circular depression created by a sunken volcanic vent in the ground, or meteoric impact
The mass of rock adjacent to, or hosting an orebody