Options: the creation of oceanic crust and the drifting of continents, the convention currents within the earth's mantle cause the creation of new oceanic crust at the mid oceanic ridges, that the oceanic crust is destroyed at areas where this crust type becomes subducted under the lighter continental crust, All of the above
The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called
Options: directly elected by the people on the basis of universal adult franchise, elected by the members of the state legislative assemblies, elected by the members of the state legislative councils, elected by the members of the state legislative councils and state legislative assemblies
From the following, choose the set in which names of Secretary-Generals of the UNO are arranged in correct chronological order?
Options: U Thant, Kurt Waldheim, Dag Hammarskjoeld, Trygve Lie., Trygve Lie, Dag Hammarskjoeld, U Thant, Kurt Waldheim., Trygve Lie, U Thant , Dag Hammarskjoeld, Kurt Waldheim., U Thant, Dag Hammarskjoeld, Trygve Lie, Kurt Waldheim.
The term 'flora' in the context of natural vegetation refers to
Options: assemblage of plant species living in association with each other in a given environmental frame, plants of a particular region or period, listed by species and considered as a group, a large tract covered by trees and shrubs and its administration for assessing economic benefits, role played by species of animals in the maintenance of ecological balance
It takes much longer to cook food in the hills than in the plains, because
Options: in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time, due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil, in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere, in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
The Latin word formica means ant. The name formic acid is derived from this Latin word because
Options: this acid, in ancient times, was used to eliminate ant-hills, this corrosive acid is secreted by ants to drive away their enemies, this acid was first obtained by the distillation of ants, ants are attracted by the odour of this acid