Clathrate gun hypothesis Extinction event

-


clathrates composites in lattice of 1 substance forms cage around another. methane clathrates (in water molecules cage) form on continental shelves. these clathrates break rapidly , release methane if temperature rises or pressure on them drops quickly—for example in response sudden global warming or sudden drop in sea level or earthquakes. methane more powerful greenhouse gas carbon dioxide, methane eruption ( clathrate gun ) cause rapid global warming or make more severe if eruption caused global warming.


the signature of such methane eruption sudden decrease in ratio of carbon-13 carbon-12 in sediments, since methane clathrates low in carbon-13; change have large, other events can reduce percentage of carbon-13.


it has been suggested clathrate gun methane eruptions involved in end-permian extinction ( great dying ) , in paleocene–eocene thermal maximum, associated 1 of smaller mass extinctions.








Comments

Post a Comment

Popular posts from this blog

Ancient Laconophilia Laconophilia

-
1 ancient laconophilia 1.1 athens 1.2 philosophers 1.3 contrary views ancient laconophilia athens in ancient athens, laconism began current of thought , feeling after persian wars. some, cimon, son of miltiades, believed athens should ally sparta against persian empire. cimon persuaded athenians send soldiers aid sparta, when helots (serfs of spartans) revolted , fortified mount ithome. spartans sent athenians home again thanks, lest democratic athenian ideas influence helots or perioeci. some athenians, disliked commerce, preferred closed society , rule of few. believed spartan constitution superior own. went far imitate spartan manners going around athens long-haired , unwashed, spartiates. plato s republic, set in 5th century bc, gives credence claim having socrates opine spartan or cretan type of political regime favorite of many . a group of extreme laconising oligarchs, known thirty tyrants, seized power in athens in 404 bc , held eleven months, assisted spartan army. rule, howe...
Read more

Ballysillan and Upper Crumlin Road Crumlin Road

-
ballysillan presbyterian church the ballysillan road leads off crumlin road , major area of loyalist housing. containing likes of silverstream , carr s glen districts, ballysillan road continues far north. circular road in turn links antrim road, began @ carlisle circus. during northern ireland troubles ballysillan noted centre loyalist paramilitary activity , home base of d company of ulster volunteer force (uvf) under command of john bingham along glenbryn, ballysillan @ centre of loyalist feud in 2003 when jimbo simpson, had been ousted head of north belfast brigade of ulster defence association (uda), attacked number of houses in area part of failed attempt retake control of brigade , force out replacement william borland. crumlin road entrance ballysillan houses historic church, ballysillan presbyterian church. due elevated , exposed location ballysillan, takes name irish language expression meaning townland of willow grove , 1 of coldest areas of city during winter. ballysilla...
Read more

Benefits Al-Anon/Alateen

-
1 benefits 1.1 problems 1.2 improvement 1.3 treatment of alcoholism benefits problems al-anon/alateen literature focuses on problems common family members , friends of alcoholics such excessive care-taking, inability differentiate between love , pity , loyalty abusers, rather problems of alcoholic. organization acknowledges members may join low self-esteem, largely side-effect of unrealistically overestimating agency , control: attempting control person s drinking behavior and, when fail, blaming other person s behavior. improvement participation in al-anon has been associated less personal blame women who, whole, engage in more initial personal blame drinking men. family members of alcoholics begin improve learn recognize family pathology, assign responsibility pathology disease, forgive themselves, accept adversely affected pathology , learn accept family members shortcomings. al-anon members encouraged keep focus on themselves, rather on alcoholic. although members believe changed ...
Read more