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A monadnock is
Answer: Option [C]Monadnock is a raised portion in a riverine plain.
Answer: Option [D]Basalt is a typical example of Igneous rocks. Basalt is a dark-coloured, fine-grained igneous rock. Basalt is one of the main rocks that are prevalent in the oceanic crust. As basalt is rich in iron, it is used as an ingredient in concrete. Basalt is the most common type of igneous rock.
Answer: Option [A]When the earth resolves round the sun it spins on an elliptical orbit at a speed of 18.9 miles/second.
Answer: Option [B]The correct answer is Gracht.
Answer: Option [B]Autumn equinox occurs in September 22. In the Northern Hemisphere the autumnal equinox falls about September 22 or 23, as the Sun crosses the celestial equator going south. In the Southern Hemisphere the equinox occurs on March 20 or 21, when the Sun moves north across the celestial equator.