Load Previous Page From kerogen to petroleum: the mature stage Deeper burial by continuing sedimentation, increasing temperatures , and advancing geologic age result in the mature stage of hydrocarbon formation, during which the full range of petroleum compounds is produced from kerogen and other precursors by thermal degradation and cracking in which heavy hydrocarbon molecules are broken up into lighter molecules. Maximum hydrocarbon generation occurs from depths of 2, to 2, metres 6, to 9, feet. Below 2, metres, primarily wet gas , a type of gas containing liquid hydrocarbons known as natural gas liquids , is formed. Approximately 90 percent of the organic material in sedimentary source rocks is dispersed kerogen. Its composition varies, consisting of a range of residual materials whose basic molecular structure takes the form of stacked sheets of aromatic hydrocarbon rings in which atoms of sulfur , oxygen , and nitrogen also occur.
Borders: revitalising an over-mature bed / RHS Gardening
Re-doing a room to lose the little kid touches starts with subtracting and gets straight to adding -- judiciously -- colors, patterns and furnishings with a more mature vibe. It doesn't have to cost the college fund if you and your stylin' daughter do most of the re-do yourselves. Color Blocks The vintage rose and blush or the crazy purple and orange color scheme has had its day. Replace the kid palette with a more sophisticated, but not at all boring, range of paint, bedding and rug hues. Go light, to transform a dark room, with stark white or vanilla walls, a patterned accent wall with an all-over stamped design, and a colorful contemporary rug in an abstract pattern against a light background. Consider a solid color ceiling to kick it up a bit in the space; celery, strawberry or iris ceiling paint is an unexpected backdrop against a rainbow chandelier or a giant white paper globe pendant. Bed and Beyond A collection of fairy-tale furnishings or random hand-me-downs needs a remodel or an upgrade.