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The Canary Islands are built upon one of the oldest regions of Earth's oceanic crust (175–147 Ma), part of the slow-moving African Plate, in the continental rise section of Northwest Africa's passive continental margin. [9] [10] The rocks under and in the Canary Islands are a record of multiple periods of volcanic activity:
Basalt columns seen on Porto Santo Island, Portugal. Columnar jointing of volcanic rocks exists in many places on Earth. Perhaps the most famous basalt lava flow in the world is the Giant's Causeway in Northern Ireland, in which the vertical joints form polygonal columns and give the impression of having been artificially constructed.
The yellow canary is typically 10 cm in length. The adult male colour ranges from almost uniform yellow in the northwest of its range to streaked, olive backed birds in the southeast. The underparts, rump and tail sides are yellow. The female has grey-brown upperparts, black wings with yellow flight feathers, and a pale supercilium. The ...
On the land, the fynbos surrounding the lagoon is home to Southern black korhaan, Cape spurfowl, Grey-winged francolin, Cape penduline and Grey tit, Ant-eating chat, White-throated and Yellow canary, Karoo lark, Chestnut-vented warbler, Bokmakierie and Cape bunting, which are all easily seen.
Basalt (UK: / ˈ b æ s ɒ l t,-ɔː l t,-əl t /; [1] [2] US: / b ə ˈ s ɔː l t, ˈ b eɪ s ɔː l t /) [3] is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon.
QAPF diagram showing the basanite/tephrite field in yellow TAS diagram with basanite/tephrite field highlighted. Basanite is an aphanitic (fine-grained) igneous rock that is low in silica and enriched in alkali metals.
Scilla natalensis : on basalt cliffs south of the Ts’ehlanyane river; Selago cf. melliodora: white inflorescence, honey scented, next to path near Matsa-mararo falls; Selago galpinii; Senecio macrocephalus; Senecio sp.: common, herbaceous shrub with masses of yellow flowers. Large stands in damp areas or rocky places
Gran Canaria shield basalt eruption, Spain; 14.5 to 14 Ma; 1,000 km3 of tholeiitic to alkali basalts [72] Campi Flegrei, Naples, Italy; 14.9 Ma; 79 cubic kilometers (19 cu mi) of Neapolitan Yellow Tuff. [4] Huaylillas Ignimbrite, Bolivia, southern Peru, northern Chile; 15 Ma ±1; 1,100 cubic kilometers (264 cu mi) of tephra. [4]