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Erratic (glacial)
| Earth Science |
Large rocks or other debris deposited by a glacier, usually in an area far removed from its source. commonly used to indicate a big chunk of debris which is clearly out of place and shouldn`t even be where it is.
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Erratic, английский
A rock fragment carried by glacial ice, or by floating ice (ice-rafting), and subsequently deposited at some distance from the outcrop from which it was derived, and generally, though not necessarily, resting on bedrock or sediments of different lithology. coarse fragments range in size from a pebble to a house-size block. gg
Erratic behavior, английский
Неустойчивое поведение
Erratic welding, английский
Erratic winds, английский
See variables.
Erratica), латинский
Erraticus, латинский
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Pyroclastic flow, английский
- Lateral flowage of a turbulent mixture of hot gases (≈400°c) and unsorted pyroclastic material (volcanic fragments, crystals, ash, pumice, and glass shards) that can move at high speed (100 miles an hour or more). also known as a "glowing avalanche" or "nueé ardente."
- A fast density current of pyroclastic material, usually very hot, composed of a mixture of gasses and a variety of pyroclastic particles (ash, pumice, scoria, lava fragments, etc.); produced by the explosive disintegration of viscous lava in a volcanic crater or by the explosive emission of gas-charged ash from a fissure and which tends to follow topographic lows (e.g. valleys) as it moves; used in a more general sense than ash flow. compare -pyroclastic surge, ash flow, nuee ardente, lahar. sw, sn, gg
Andesite, английский
- Intermediate volcanic rocks containing 54 to 62 percent silica and moderate amounts of iron and magnesium. andesite minerals commonly include plagioclase and hornblende, with lesser amounts of mica, pyroxene, and various accessory minerals. andesites are aphanitic in texture and are usually medium dark in color. they occur with composite volcanic cones associated with convergent plate margins.
- Андезит
- A fine-grained igneous rock formed essentially of plagioclase,
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