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In structural geology, a fold is a stack of originally planar surfaces, such as sedimentary strata, that are bent or curved ("folded") during permanent deformation. Folds in rocks vary in size from microscopic crinkles to mountain-sized folds. They occur as single isolated folds or in periodic sets (known as fold trains).
3×4-fold, 4×3-fold, and 6×2-fold axes: the rotation group O of order 24 of a cube and a regular octahedron. The group is isomorphic to symmetric group S 4. 6×5-fold, 10×3-fold, and 15×2-fold axes: the rotation group I of order 60 of a dodecahedron and an icosahedron. The group is isomorphic to alternating group A 5.
A grandmaster draw is characterised as a short draw between high-level players, typically intended to hold position without the expenditure of mental energy. As short draws by agreement are sometimes frowned upon or outright banned in tournaments, some players circumvent such rules by playing out lines known to end in threefold repetition draws.
Fold mountains form in areas of thrust tectonics, such as where two tectonic plates move towards each other at convergent plate boundary.When plates and the continents riding on them collide or undergo subduction (that is – ride one over another), the accumulated layers of rock may crumple and fold like a tablecloth that is pushed across a table, particularly if there is a mechanically weak ...
If the angle between the limbs is large (70–120 degrees), then the fold is an "open" fold, but if the angle between the limbs is small (30 degrees or less), then the fold is a "tight" fold. [4] If an anticline plunges (i.e., the anticline crest is inclined to the Earth's surface), it will form V s on a geologic map view that point in the ...
Consequences can also be played in a drawing version, sometimes known as picture consequences, where the first player draws the head, passes it unseen (by means of folding) to the second player who draws the body, then on to the third player who draws the legs. The composite person or creature is then revealed to all by unfolding the paper.
Fold the strip in half again to the right, and the turn sequence of the unfolded strip is now RRLRRLL – the third iteration of the Heighway dragon. Continuing folding the strip in half to the right to create further iterations of the Heighway dragon (in practice, the strip becomes too thick to fold sharply after four or five iterations).
Cross-section diagram of a thrust fault with a fault-bend fold. A thrust fault has the same sense of motion as a reverse fault, but with the dip of the fault plane at less than 45°. [21] [22] Thrust faults typically form ramps, flats and fault-bend (hanging wall and footwall) folds.