Green house effect is the trapping of heat by some gases ! mainly in our earth this is increasing due to CO2 !
Answer: (C) A hot spot
Explanation:
A hot spot is created in the volcanic peaks and it is basically developed over the plume. The mantle plumes are the areas of the up-welling and the hot mantle areas. Magma created by the problem area ascends through the unbending plates in the lithosphere layer.
It produces the dynamic volcano at the surface of the earth. In the mantle area, the hot spot are generated in which the rocks are get melted for generating the magma. The hot spot generated the heat are basically comes from the middle of the earth.
The second assumption is that there is something exceptional about Africa, that while other continents and peoples have got or are getting richer, Africans, for reasons we can think but no longer speak in polite company, choose to remain in poverty. Our capacity to see Africa as divergent lets us off the hook so we don’t have to understand our own complicity in the challenges various African countries face today. It also means we rarely rage as we should against the actions of the corporations and governments that profit from instability, corruption or even inexperience (African negotiators at the climate talks have historically been disadvantaged by their lack of experience and the expectation among western negotiators that they should be grateful with whatever they get).
If there is, then, no innate propensity for corruption, violence or poverty in Africa, then the narratives that fuel the stereotypes need questioning. One possible explanation comes from the Nigerian author Chinua Achebe, who said: “The west seems to suffer deep anxieties about the precariousness of its civilisation and to have a need for constant reassurance by comparison with Africa.” Perhaps it’s not Africa that needs saving, but us.
Ocean water is most saline in dense seawater.
answer: b. in dense seawater.