the down-fold portion of a fold mountain is (name the following):-
Answers
Explanation:
Fold mountains are created where two or more of Earth’s tectonic plates are pushed together. At these colliding, compressing boundaries, rocks and debris are warped and folded into rocky outcrops, hills, mountains, and entire mountain ranges.
Types of Folds
Fold mountains are defined by complex, vital geologic forms known as folds. There are many, many different types of folds. Geologists primarily categorize folds by their shape—do they have sharp turns or gentle curves? Are the folds convex or concave?
A fold mountain usually displays more than one type of fold. Anticlines and synclines are the most common up-and-down folds that result from compression. An anticline has a ∩-shape, with the oldest rocks in the center of the fold. A syncline is a U-shape, with the youngest rocks in the center of the fold.
Domes and basins are often considered types of folds. A dome is a series of symmetrical anticlines, roughly shaped like half a sphere. Like an anticline, the oldest rocks in a dome are found in the center. A basin is a depression, or dip, in Earth’s surface. Like a syncline, a basin has its youngest rocks in its center.
Other types of folds include:
monoclines. A monocline is a type of fold in which all rock layers incline, or dip, in the same direction.
chevron. A chevron is a sharp, straight fold where rock layers look like zig-zags.
slump. A slump fold is a result of slope failure (a type of mass wasting or landslide). The slope failure happened when sediments were soft, before they became a single mass of rock. As the sediments lithified, they became a slump.
ptygmatic. Ptygmatic folds are a type of slump fold created where the folding material is much more viscous than the material surrounding it. Many ptygmatic folds are created as metamorphic rock melts and intrudes into another rock layer, forming a dike.
disharmonic. Disharmonic folds describe rock formations in which different rock layers have different fold shapes.
tectonic plate
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