Yanayin Saint Helena

**Saint Helena** tsibiri ne a cikin Tekun Atlantika ta Kudu, game da tsakiyar tsakanin Amurka ta Kudu da Afirka . St Helena tana da yanki na murabba'in kilomita 122 kuma tana cikin yankin Tristan da Cunha">Saint Helena, Ascension da Tristan da Cunha wanda ya haɗa da Tsibirin Ascension le tsibirin tsibirin Tristan da cunha .

## Yanayi ciki

### Yanayi

Za'a iya bayyana yanayin tsibirin Saint Helena a matsayin na wurare masu zafi, na ruwa da na sauƙi, wanda Benguela Current da iskar kasuwanci ke hurawa kusan koyaushe. Hakazalika, yanayin Tristan da Cunha na ruwa ne, mai laushi kuma yana da Iska ta kasuwanci, kodayake yanayin yana da matsakaici a yanayi. Tsibirin Ascension ya fi zafi kuma ya fi St Helena.

### Yankin

Saint Helena tana da tsaunuka masu tsawo, tsaunuka, tare da ƙananan tsaunuka da filayen da aka warwatsa, tare da mafi girman yanki na ƙasa a tsibirin shine Prosperous Bay Plain a gabashin busassun yankin. Sauran tsibirai na rukuni suna da asalin dutsen wuta. Matsayi mafi girma a tsibirin shine Diana's Peak a mita 818 (2,684 ft), kodayake Sarauniya Mary's Peek a kan Tristan da Cunha shine mafi girma a yankin Burtaniya a 2,062 m.&nbsp;

Hadarin halitta a kan Tristan da Cunha shine dutsen wuta mai aiki, kodayake wannan ba haka ba ne a kan St Helena kanta.

### Ilimin ƙasa

St. Helena ta wanzu saboda wurin St. Helena hotspot wanda ya fara samar da basaltic lava kimanin shekaru miliyan 145 da suka wuce lokacin da yake kusa da madaidaicin farantin karfe na Mid-Atlantic Ridge. Motsi na Plate na Afirka daga wurin da ke da zafi ya bar sarkar tsaunin St. Helena, wanda zai iya haɗawa da Layin Volcanic na Kamaru. St. Helena, mafi kudu maso yamma akan sarkar, yana kusa da gefen farantin karfe, amma fashewar volcanic na ƙarshe ya faru kimanin shekaru miliyan 7 da suka wuce.

An yi bincike na farko na ilimin ƙasa na St. Helena lokacin da Charles Darwin ya ziyarci tsibirin a kan tafiyar HMS Beagle a watan Yulin 1836. Ya "yi amfani da abubuwan lura a kan St Helena don tsara wani ra'ayi na tsakiya (wanda aka buga a cikin 1844 a cikin littafinsa "Geological Observations on the volcanic islands and parts of South America visited during the Voyage of HMS "Beagle") - tsaunuka masu fashewa suna tashi ta hanyar jinkiri, sannu a hankali da abubuwan da suka faru".

#### Yanayin ƙasa
Barn shine murfin ƙananan lavas a kan duwatsu masu rauni. Barn yana da dutsen da ke gefen da ke fuskantar teku. Yana kallon pyroclasts da raunin kwararar Turk's Cap Valley zuwa kudu.

Ɗaukar sunayensu daga labarin Lutu a cikin Littafin Farawa, "Lutu" da "Matar Lutu" su ne ginshiƙai guda biyu na dutsen da ke saman kwaruruka biyu kusa da Sandy Bay. ginshiƙan kutsawa na phonolitic ne, waɗanda suka fi juriya ga zazzagewa fiye da kewayen abubuwan da ke kewaye da dutsen mai aman wuta waɗanda, cikin lokaci, suka shuɗe.

### Albarkatun halitta
Saint Helena tana da kifi a matsayin babban albarkatun halitta. Amfani da ƙasa a cikin tsibirin tsibirin an raba shi tsakanin ƙasar noma (tare da 12.9% na yankin da aka ba wannan) da sauran amfani, waɗanda ke mamaye sauran 87.1%.

Dangane da ikirarin teku, St Helena tana da yankin kamun kifi na musamman na mil 200 na teku, da kuma teku mai yanki na mil goma sha biyu na teku.

### Tsibirin
Kusan gabar tekun tsibirin St Helena kanta akwai ƙananan tsibirai masu yawa. An fara daga arewa da kuma tafiya ta agogo, waɗannan sune: Shore Island, George Island, Rough Rock Island, Flat Rock, The Buoys, Sandy Bay Island, Black Horse Island, White Bird Island, Frightus Island, Jar Rock, Castle Point Rock, Robert Rock, Salt Rock, Speery Island, Flat Rock, The Needle, Lower and Upper Black Rock, Birdhompson Island, Black Rockk Island, Peas Island, T. Kujerar Lady, Dutsen Haske, Dogon Ledge, da Dutsen Ja.

## Muhalli
Saint Helena tana da akalla nau'ikan shuke-shuke 40 da ba a sani ba a ko'ina a duniya, kuma Ascension wuri ne na kiwo ga tururuwan teku da sooty terns.

## Gundumomi
Tsibirin St Helena ya kasu kashi 8,  wanda ake amfani da shi don dalilai na zabe da gudanarwa.