Portal:Mountains

A trim line, also written as trimline, is a clear line on the side of a valley formed by a glacier. The line marks the most recent highest extent of the glacier. The line may be visible due to changes in color to the rock or to changes in vegetation on either side of the line.

The term "trim line" is also used for similar looking phenomena caused by floods, volcanic activity, or tsunamis. (Full article...)

The Craigieburn Range forms part of the Southern Alps in New Zealand's South Island. The range is located on the south banks of the Waimakariri River, south of Arthur's Pass and west of State Highway 73. The Craigieburn locality is adjacent to the Craigieburn Forest Park. (Full article...)

Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles to settle in place. The particles that form a sedimentary rock are called sediment, and may be composed of geological detritus (minerals) or biological detritus (organic matter). The geological detritus originated from weathering and erosion of existing rocks, or from the solidification of molten lava blobs erupted by volcanoes. The geological detritus is transported to the place of deposition by water, wind, ice or mass movement, which are called agents of denudation. Biological detritus was formed by bodies and parts (mainly shells) of dead aquatic organisms, as well as their fecal mass, suspended in water and slowly piling up on the floor of water bodies (marine snow). Sedimentation may also occur as dissolved minerals precipitate from water solution.

The sedimentary rock cover of the continents of the Earth's crust is extensive (73% of the Earth's current land surface), but sedimentary rock is estimated to be only 8% of the volume of the crust. Sedimentary rocks are only a thin veneer over a crust consisting mainly of igneous and metamorphic rocks. Sedimentary rocks are deposited in layers as strata, forming a structure called bedding. Sedimentary rocks are often deposited in large structures called sedimentary basins. Sedimentary rocks have also been found on Mars. (Full article...)

Traditional climber leading Super Crack 5.9 (5c) in the New River Gorge, West Virginia

Traditional climbing (or trad climbing) is a type of free climbing in rock climbing where the lead climber places the protection equipment while ascending the route; when the lead climber has completed the route, the second climber (or belayer) then removes the protection equipment as they climb the route. Traditional climbing differs from sport climbing where the protection equipment is pre-drilled into the rock in the form of bolts.

Traditional climbing carries a much higher level of risk than bolted sport climbing as the climber may not have placed the protection equipment correctly as they try to ascend the route, or there may be few opportunities to insert satisfactory protection (e.g. on very difficult routes). Traditional climbing was once the dominant form of free climbing but since the mid-1980s sport climbing (and its related form of competition climbing) became more popular, and all subsequent grade milestones from 8a+ (5.13c) onwards were on sport climbing routes. (Full article...)

A ski binding is a device that connects a ski boot to the ski. Before the 1933 invention of ski lifts, skiers went uphill and down and cross-country on the same gear. As ski lifts became more prevalent, skis—and their bindings—became increasingly specialized, differentiated between alpine (downhill) and Nordic (cross-country, Telemark, and ski jumping) styles of skiing. Until the point of divergence in the mid-20th century, bindings held the toe of a flexible, leather boot against the ski and allowed the heel to rise off the ski, typically with a form of strap or cable around the heel.

To address injuries resulting from falls while skiing downhill on such equipment, ski bindings emerged with the ability to release the toe of the boot sideways, in early models, and to release the boot forward and aft, in later models. Downhill ski bindings became standardized to fit plastic ski boots and incorporated a built-in brake that drags in the snow after the ski detaches from the boot. (Full article...)

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