What's the difference between reef and shelf?

Reef


Definition:

  • (n.) A chain or range of rocks lying at or near the surface of the water. See Coral reefs, under Coral.
  • (n.) A large vein of auriferous quartz; -- so called in Australia. Hence, any body of rock yielding valuable ore.
  • (v. t.) That part of a sail which is taken in or let out by means of the reef points, in order to adapt the size of the sail to the force of the wind.
  • (v. t.) To reduce the extent of (as a sail) by roiling or folding a certain portion of it and making it fast to the yard or spar.

Example Sentences:

  • (1) One of the main users is coastal planning organizations and conservation organizations that are working on coral reefs.
  • (2) It is resilient, but like all reefs around the world, it is also facing challenges.
  • (3) What are the major threats that face the world's coral reefs and what more needs to be done to protect them?
  • (4) Greg Hunt , the environment minister, said he will use the existing Great Barrier Reef Marine Park Authority act to “put in place this ban in legislative form”.
  • (5) World Wildlife Fund Great Barrier Reef campaigner Richard Leck said it was a sad day for the reef and anyone who cared about its future.
  • (6) But the Guardian can now reveal Australia will also need to report on how it is dealing with the current bleaching, where almost a quarter of the coral on the reef has been killed.
  • (7) The federal court is being asked to overturn the environment minister, Greg Hunt’s approval of Indian company Adani’s $16.5bn Queensland coalmine because he did not take into account the impact on the Great Barrier Reef of the greenhouse gases emitted when the coal is burned.
  • (8) But it welcomed Australia’s 2050 long-term sustainability plan for the reef , which includes an 80% cut in water pollution by 2025 and an extra $200m (AUD) to accelerate that progress in the next five years.
  • (9) Guillermo Diaz-Pulido, a Griffith University associate professor, said the research was “a major step forward in understanding how seaweeds can harm corals and has important implications for comprehending the consequences of increased carbon dioxide emissions on the health of the Great Barrier Reef”.
  • (10) Warming water will make it hard for many of the reef’s corals to survive, while the acidification of the oceans will hinder the ability of remaining corals to form their skeletons.
  • (11) A recent study suggests that coral disease is doubled when dredging occurs near reefs, although supporters of the dredging have repeatedly insisted it can be done safely and that the Abbot Point sediment will be dumped around 40km from the nearest reef.
  • (12) This process hinders the ability of corals to produce the skeletal building blocks of reefs.
  • (13) So are you optimistic then about the future survival of the world's coral reefs in the long term?
  • (14) They want to send a very clear message to China that they are serious about this.” Facebook Twitter Pinterest This image from the US navy purportedly shows Chinese dredging vessels in the waters around Mischief reef in the disputed Spratly archipelago in May 2015.
  • (15) He can come any time he likes, he’s absolutely welcome to come to Australia, to come to Queensland and to come to the Great Barrier Reef,” she said in Brisbane.
  • (16) Facebook Twitter Pinterest Coral bleaching on the Great Barrier Reef worse than for decades The photos were taken from around Lizard Island by Lyle Vale from Coral Watch at the University of Queensland .
  • (17) The prime minister has been urging all Australians to remain calm in the face of increased terrorism threats,” said the society’s reef campaign director, Felicity Wishart.
  • (18) So we looked at the economic contribution of tourists to that area and compared it with the cost of interventions to improve water quality and coral reef health in that area.
  • (19) Chinese authorities said earlier they had monitored, followed and warned US warship USS Lassen as it “illegally” entered waters near the disputed reefs, and urged Washington to “immediately correct its mistake”.
  • (20) It was the fourth mass bleaching to hit the reef in recorded history – all since 1998 – and coral scientists are alarmed the increasing regularity of these events gives stressed coral precious little chance to recover.

Shelf


Definition:

  • (v. i.) A flat tablet or ledge of any material set horizontally at a distance from the floor, to hold objects of use or ornament.
  • (v. i.) A sand bank in the sea, or a rock, or ledge of rocks, rendering the water shallow, and dangerous to ships.
  • (v. i.) A stratum lying in a very even manner; a flat, projecting layer of rock.
  • (v. i.) A piece of timber running the whole length of a vessel inside the timberheads.

Example Sentences:

  • (1) Since he was created, he has appeared at several robotic fairs across China, but spends most of his time in deep meditation on an office shelf in Longquan.
  • (2) Matches on the NDCD tape could be found for 80% of the items in the shelf stock sample and 69.5% of the items in the tape supplied by the wholesaler.
  • (3) The development of the hydrogelic occlusive device called the P-block is described including developmental steps of the design of the device as well as the experience gained concerning the hydrogel of the device, shelf life, animal and human toxicology, insertion techniques, analgesia, check-up for retention in situ, actual efficacy of the method, mode of action of the device, complication rates, patient acceptance, continuation rates, possible reversibility and future perspectives of the method.
  • (4) Formulation often has a dramatic effect on degradation of proteins during the freeze-drying process as well as impacting on the "shelf-life" stability of the freeze-dried product.
  • (5) The determination of potency or shelf life, impurity limit testing, and study of reaction mechanisms are considered as different aspects of drug stability.
  • (6) Patterns of HA distribution in anterior, posterior and presumptive soft palate were examined in the secondary palatal shelves of CD-1 mouse fetuses that were 30, 24 and 18 h prior to, and at the time of, shelf reorientation.
  • (7) Another pint of Guinness That evening we set out again, this time to O'Donoghue's in Fanore, a blue-painted stone pub set on the thin shelf of land between the sea and the great limestone mountain that is called the Burren.
  • (8) The absence of membrane proteins and chemical stability of SFH and phospholipids promises long shelf-life.
  • (9) So, they start to create these almost fictitious things they can sell, whether it’s a prime shelf [at the height a shopper is most likely to see] or a gondola end [the promotional buckets often found at the top of the aisle].
  • (10) Midline epithelial cells cease DNA synthesis 24-36 h before shelf elevation and contact, become active in the synthesis of cell surface glycoproteins, and subsequently manifest morphological signs of necrosis.
  • (11) It has been suggested that head posture changes, tongue movements and jaw opening reflexes are required to enable palatal shelf elevation to occur in normal cranio-facial development.
  • (12) Allografts are often freeze dried to increase shelf storage time and sterilized with ethylene oxide.
  • (13) The shelf procedure provides a buttress of bone for later reconstructive surgery such as cup or total hip arthroplasty.
  • (14) When tested in another task (recovering food pellets from a horizontal shelf accessible through a narrow slit below the ceiling of the test box) same rats displayed identical (45%) and opposite (15%) preference or were ambidextrous (40%).
  • (15) In one case this was a dense shelf-like mass of echoes extending downward from the basal portion of the interventricular septum toward the mid-portion of the anterior mitral leaflet with corresponding systolic anterior motion of the mitral leaflet.
  • (16) Eight brands of composite resin, including paste-paste, powder-liquid and light-activated systems, as well as three glass ionomer cements were evaluated over a period of twelve months with respect to shelf-life and suitability for use in a tropical environment.
  • (17) They know that you're just going to buy everything from Amazon now, so they've all cut their losses and stacked every shelf with a trillion different 50 Shades Of Grey knock-offs called things like Disciplined With Buttplugs and 20 Carat Strumpet.
  • (18) The shelf life of the solid phase presensitized with monoclonal antibodies was 4 mth at -15 degrees C. DEN prototype viruses were still identified after storage at -15 degrees C for 1 yr or at room temperature for 1 mth.
  • (19) There are now standard off-the-shelf products that provide the kind of digital production tools that simply didn't exist five years ago.
  • (20) It is concluded that the shelf life of iced whole cod can be predicted using this model but not that of vacuum-packed fillets because of the greater variability of bacterial activity in packaged fish.