Lithosphere - Study Mode
[#126] Extensive deserts occur in the western tropical regions of continents because
Correct Answer
(C) Of the effect of both the offshore easterly
Explanation
Solution: Extensive deserts occur in the western tropical regions of continents because of the effect of both the offshore easterly trade winds & cold ocean currents. Trade minds blow away from the western sides of the continents thus dumping the moisture they carry from oceans on eastern sides of other
continents. Also, there are cold ocean currents on western side near almost all continents due to which scanty or no rain occurs in the sea water.
[#127] The Hawaii islands are the top of submerged ________
Correct Answer
(C) Volcanic mountains
Explanation
Solution: The Hawaii islands are the top of submerged volcanic mountains. The Hawaiian Emperor seamount chain is a well-known example of a large seamount and island chain created by hot-spot volcanism. Each island or submerged seamount in the chain is successively older toward the northwest.
[#128] The principal reason for the formation of metamorphic rocks is ________
Correct Answer
(C) Extreme heat and pressure
Explanation
Solution: The principal reason for the formation of metamorphic rocks is extreme heat and pressure. Metamorphic rocks were once sedimentary, igneous or even other metamorphic rocks that have been changed by heat and pressure. Contact metamorphism occurs when magma intrudes or forces its way into existing rock. The heat of the magma bakes the surrounding rocks causing them to change.
[#129] Which of the following areas or regions is most prone to earthquakes?
Correct Answer
(B) Ganga Brahmaputra Valley
Explanation
Solution: As Ganga Brahmaputra Valley lies near the foot hills of the Himalayas they are more susceptible to earthquakes as compared to other regions given in
option.
[#130] Which form of coal is mainly suitable for producing thermal power?
Correct Answer
(B) Bituminous
Explanation
Solution: Bituminous coal is mainly suitable for producing thermal power. Bituminous coal is mined in the Appalachian region, primarily for power generation. Mining is done via both surface and underground mines.