Answer: South American plate and African plate
Explanation: Tristan de cunha is a volcano that has formed approximately 150 million years back when the plates namely, the African plate and the South American plate moved in the opposite direction. Due to this diverging plate motion, the Atlantic ocean was formed.
Tristan de cunha is a stratovolcano, having a total height of about 6000 m, of which, about 4000 m lies below the sea level and 2000 m lies above the sea level. It is located at about 500 km towards east of the Mid-Atlantic ridge. The volcano is surrounded by the lava flows and pyroclastic rocks that must have erupted from the volcano in the past.
It is a transitional eco region of a semi-arid grasslands ,savanna’s ,steppes and thorn scrublands. It lyes between the wooded sudanian savanna to the south and it’s on the Sahara to the north. The Sahel’s topography is mainly a flat land.most of the region lies between 200 and 400 meters in elevation.it also borders south Saharan steppe and is in Senegal , Mauritania
<span><em><u>B).the long-term, prevailing atmospheric conditions</u></em></span>
The long term average being 30 years. These weather variations are affected by the temperature, precipitation, and wind.
Climate determinants include latitude, altitude, proximity to mountains and oceans, proportion of land to water, thermohaline circulation of the ocean, ocean currents, density and type of vegetation present in an area, as well as the areas' water retention and rainfall.
Climate are classified into three groups. These are Bergeron and Spatial Synoptic, Koppen, and Thornthwaite.
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Explanation:
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