Ocean-Floor Sediments Ocean-Floor Sediments Sediment on the seafloor originates from a variety of sources, including biota from the overlying ocean water, eroded material from land transported to the ocean by rivers or wind, ash from volcanoes, and chemical precipitates derived directly from sea water. A very small amount of it even originates as interstellar dust. In short, the particles found in sediment on the seafloor vary considerably in composition and record a complex interplay of processes that have acted to form, transport, and preserve them. Geological oceanographers have coined the terms “terrigenous” to describe those sediments derived from eroded material on land, “biogenic” for those derived from biological matter, “volcanogenic” for those that include significant amounts of ash, “hydrogenous” for those that precipitate directly from sea water, and “cosmogenic” for those that come from interstellar space. The seafloor, however, is not a random arrangement of these different sediment types. Oceanographers have painstakingly mapped the distribution of sediment around the globe and have learned that at any given location the sediments provide important information regarding the history of the ocean as well as the overall state of climate on the Earth’s surface. By studying how the heterogeneous composition of sediment varies as a function of geographic location and age, oceanographers are able to document the geologic and climatic conditions that are responsible for that sediment. Oceanographers study sediment by taking long cylindrical cores, which individually can be as long as 18 to 30 meters 60 to 98 feet. Because the bottom of the ocean is extremely cold only 1 to 3 degrees above freezing , the cores are stored in refrigerators onboard the research ship prior to being stored in large refrigerated repositories at shore-based laboratories. In their laboratories, scientists study the physical, chemical, and biological makeup of the sediment.
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History of seafood Various foods depicted in an Egyptian burial chamber, including fish, c. The harvesting, processing, and consuming of seafoods are ancient practices with archaeological evidence dating back well into the Paleolithic. During this period, most people lived a hunter-gatherer lifestyle and were, of necessity, constantly on the move. However, where there are early examples of permanent settlements though not necessarily permanently occupied such as those at Lepenski Vir , they are almost always associated with fishing as a major source of food.
The ancient river Nile was full of fish; fresh and dried fish were a staple food for much of the population.
Description: I live just a few miles from the Atlantic Ocean. I love the sea turtles and beautiful fish which inspired this collection.
See Article History Alternative Title: In a more general sense, a carnivore is any animal or plant; see carnivorous plant that eats other animals, as opposed to a herbivore , which eats plants. Although the species classified in this order are basically meat eaters, a substantial number of them, especially among bears and members of the raccoon family, also feed extensively on vegetation and are thus actually omnivorous.
Canidae dogs and related species , Felidae cats , Ursidae bear s , Procyonidae raccoon s and related species , Mustelidae weasel s, badger s, otter s, and related species , Mephitidae skunk s and stink badgers , Herpestidae mongoose s , Viverridae civet s, genet s, and related species , and Hyaenidae hyena s. There are three aquatic families: Otariidae sea lion s and fur seal s , Phocidae true, or earless, seal s , and Odobenidae the walrus. These aquatic families are referred to as pinniped s.
Lions Panthera leo engaging in various activities such as hunting, eating, grooming, and sleeping. Importance of Carnivora Two carnivores are probably the animals most familiar to people: On the other hand, various bears, felines, canines, and hyenas are among the few animals that occasionally attack humans. These large, dangerous carnivores are often the objects of hunters, who kill them for display as trophies.
Most luxurious natural furs ermine , mink , sable , and otter, among others come from members of Carnivora, as do many of the animals that attract the largest crowds at circuses and zoos. Producers of livestock worldwide are concerned about possible depredations upon their herds and flocks by this group of mammals. In areas of human settlement, this precarious balance has frequently been upset by the extermination of many carnivores formerly considered undesirable because of their predatory habits.
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They are old, primitive creatures, yet so effective that they hold their own in our modern world. Scientists would be interested to see what they actually looked like when they first appeared on Earth, but their soft bodies left few fossil traces. In this article we’ll examine the few large species found in New Zealand waters. But jellyfish are also harbingers of pollution that kills other marine organisms. The jellyfish of the world are such effective ocean wanderers that they haven’t diversified very much.
Seafood is any form of sea life regarded as food by humans. Seafood prominently includes fish and ish include various species of molluscs, crustaceans, and ically, sea mammals such as whales and dolphins have been consumed as food, though that happens to a lesser extent in modern times. Edible sea plants, such as some seaweeds and microalgae, are widely eaten.
So suggests new research that tracked changes in two genes thought to help regulate brain growth, changes that appeared well after the rise of modern humans , years ago. That the defining feature of humans — our large brains — continued to evolve as recently as 5, years ago, and may be doing so today, promises to surprise the average person, if not biologists. Lahn and colleagues examined two genes, named microcephalin and ASPM, that are connected to brain size.
If those genes don’t work, babies are born with severely small brains, called microcephaly. Using DNA samples from ethnically diverse populations, they identified a collection of variations in each gene that occurred with unusually high frequency. In fact, the variations were so common they couldn’t be accidental mutations but instead were probably due to natural selection, where genetic changes that are favorable to a species quickly gain a foothold and begin to spread, the researchers report.
Lahn offers an analogy: Medieval monks would copy manuscripts and each copy would inevitably contain errors — accidental mutations. Years later, a ruler declares one of those copies the definitive manuscript, and a rush is on to make many copies of that version — so whatever changes from the original are in this presumed important copy become widely disseminated.
Scientists attempt to date genetic changes by tracing back to such spread, using a statistical model that assumes genes have a certain mutation rate over time. For the microcephalin gene, the variation arose about 37, years ago, about the time period when art, music and tool-making were emerging, Lahn said. For ASPM, the variation arose about 5, years ago, roughly correlating with the development of written language, spread of agriculture and development of cities, he said.
Other scientists urge great caution in interpreting the research.
Plenty of Fish couple gets married underwater
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Jan 26, · In a nautical ode to their love story, one adventurous couple who met on the dating site Plenty of Fish have officially tied the knot under the sea. Though Lauren and Gary Dongray of .
My Daughter Upstairs Morning of November 23, King Street boarding house in La Crosse in late morning. Irrelevant to waking life since I may have descended the imaginary staircase though I do not have the memory of it to sustain and vivify my dream. I am at the bottom of the staircase from the second floor, where there is the fictitious feature of an L-shaped foyer where I remain until my dream ends. My landlady comes in from her kitchen and tells me to mop the floor in this area.
The mop bucket is to my left. The mop is next to it. I do not use any water. I guide the mop over the floor and soon see a C-shaped clump of dust that it gathers and consider if I should tell the landlady that I should sweep the floor first. Soon, I see several Kinder Surprise toys on the floor, one of them a small penguin figure. I move the mop, and they are all in a small cluster. I hear my youngest daughter talking from upstairs, though I do not discern what she is saying.
My landlady comes in again from her kitchen and asks me if my daughter has eaten yet.
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Captain George Pollard Jr. Pollard lived out his remaining years on land, as the village night watchman. Melville had written about Pollard briefly in Moby-Dick, and only with regard to the whale sinking his ship. To Bennet, the tale was like a confession.
The True-Life Horror That Inspired Moby-Dick This time it hit the bow directly under the cathead and disappeared for good. It was the custom of the sea, dating back, at least in recorded.
The fisherman who told the tale preferred to nameless, and confided only that he and his friend were from the East. The other three men who had been part of the three-day fishing excursion around Puget sound were from Tacoma. M, and as the wind was from the southeast we shaped our course for Point Defiance. There they made camp for the night. Sometime after midnight, the sleeping campers were startled by a terrifying noise. A stinging sensation like thousands of electrified needle points suddenly stabbed through their clothing.
Shoreline decay at Salton Sea Beach. I’m not gonna smell it, YOU smell it. Salton Sea Test Base.
The deepest-ever species of fish has been recovered from the Mariana Trench. Thriving at 26, feet below sea level, the small, slimy and translucent fish have somehow adapted to one of the.
History of seafood The harvesting, processing, and consuming of seafoods are ancient practices with archaeological evidence dating back well into the Paleolithic. During this period, most people lived a hunter-gatherer lifestyle and were, of necessity, constantly on the move. However, where there are early examples of permanent settlements though not necessarily permanently occupied such as those at Lepenski Vir , they are almost always associated with fishing as a major source of food.
The ancient river Nile was full of fish; fresh and dried fish were a staple food for much of the population. Some representations hint at fishing being pursued as a pastime. World fisheries harvest, both wild and farmed, in million tonnes, —  World fisheries harvest, wild capture versus aquaculture production, in million tonnes —  Fishing scenes are rarely represented in ancient Greek culture, a reflection of the low social status of fishing. However, Oppian of Corycus , a Greek author wrote a major treatise on sea fishing, the Halieulica or Halieutika, composed between and This is the earliest such work to have survived to the modern day.
The consumption of fish varied in accordance with the wealth and location of the household. In the Greek islands and on the coast, fresh fish and seafood squid , octopus , and shellfish were common.