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15 Cards in this Set

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The three spheres deeply intertwined in the creation of sediment and in it becoming sedimentary rock are?
Atmosphere, Hydrosphere, Biosphere.
Atmosphere
Wind is one of the agents by which sediment is transported. Sand is skipped along the ground mpving in ripples often creating sand dunes. Dust is deposited on everything, carried by the wind over great distances and deposited on land and sea.
Hydrosphere
Water is a vital ingredient in the transportation of sediment. Sediment is transported and further modified during this transportation by streams and ocean currents. Glaciers also move sediment. The conversion of sediment to sed. rx usually involves water. Water carrying dissolved materials flows between grains of sediment. Precipitation on these grains cements them together and sediment turns into sed. rx.
Biosphere
Part or all of many sed. rx. are made by organisms. Limestone, for example is often made from the shells or remains of other hard parts of animals. Plants can partially decompose and be converted for coal Which is rock). We depend on crude oil as our principle source of crude oil. Crude oil is found in sed. rx. and is formed through the partial decay of organic matter.
Sediment
Sediment is the collective name for loose, solid particles that originate from from:
1. Weathering and
erosion of preexisting
rocks.
2. Chemical precipitation
from solution,
including secretion by
organisms in water.
Gravel
Gravel in cludes all rounded particles coarser than 2mm in diameter, the thickness of of a U.S. nickel.
Rubble (Gravel)
Angular fragments of gravel.
Pebbles (Gravel)
Pebbles range from 2-64mm (about the size of a tennis ball).
Cobbles (Gravel)
Cobbles range from 64-256mm (the size of a basketbal).
Boulders (Gravel)
Boulders are coarser than 256mm.
Sand
Sand grains are from 1/16mm (about the thickness of a human hair) to 2mm in diameter. Grains of this are visible and feel gritty between the fingers.
Silt (Sand)
Silt grains are 1/256-1/16 in diameter. Too small to be seen with a magnifying lens. They feel gritty to the teeth, not between the fingers.
Clay (Sand)
Clay is the finest sediment, at less than 1/256mm to fine to feel gritty to the teeth or to the fingers.
Mud
Loosely defined as wet silt and clay.
Clay size particle vs. clay mineral
Clay sized particles can be comprised of any mineral at all provied it's diameter is less than 1/256mm. A clay mineral is one of a small group of silicate minerals with a sheet silicate structure. Clay minerals usually form in the clay sized range.