Q21) Which theory combined Continental Drift and Seafloor Spreading into a unified explanation?
a) Expanding Earth Theory
b) Plate Tectonic Theory
c) Convection Current Theory
d) Geosynclinal Theory
Explanation: Plate Tectonic Theory (1960s) unified earlier ideas of Continental Drift and Seafloor Spreading, explaining that Earth’s lithosphere is divided into plates moving over the asthenosphere, accounting for earthquakes, volcanoes, and mountain building.
Q22) What was the major weakness in Wegener’s Continental Drift Theory?
a) Lack of fossil evidence
b) Lack of explanation for the driving mechanism
c) Contradiction with maps
d) Over-dependence on ocean currents
Explanation: Although Wegener presented strong fossil and geological evidence, he could not explain how massive continents drifted across the Earth’s surface. This gap was later filled by Seafloor Spreading and Plate Tectonic Theory.
Q23) The Expanding Earth Theory suggested that:
a) Continents shrink over time
b) Earth is slowly expanding, causing continents to drift
c) Continents remain fixed
d) Continents are pulled by moon’s gravity
Explanation: The Expanding Earth Theory proposed that Earth’s volume increases over time, pushing continents apart. This theory is largely rejected today, as Plate Tectonic Theory provides more accurate explanations.
Q24) What are tectonic plates made of?
a) Sedimentary rocks
b) Crust and upper mantle (lithosphere)
c) Outer core
d) Molten magma only
Explanation: Tectonic plates consist of the rigid lithosphere, which includes the Earth’s crust and the uppermost solid mantle. These plates float on the asthenosphere and move due to mantle convection currents.
Q25) Who proposed the Convection Current Theory explaining continental movement?
a) Harry Hess
b) Arthur Holmes
c) Alfred Wegener
d) James Hutton
Explanation: Arthur Holmes suggested that convection currents within the Earth’s mantle drive the movement of continents. This theory laid groundwork for later acceptance of Plate Tectonic Theory.
Q26) Which supercontinent did Alfred Wegener propose existed about 300 million years ago?
a) Gondwana
b) Laurasia
c) Pangaea
d) Rodinia
Explanation: Wegener proposed that around 300 million years ago, all continents were joined together in a supercontinent called Pangaea, which later broke apart into smaller continents.
Q27) What was the northern part of Pangaea called?
a) Gondwana
b) Laurasia
c) Panthalassa
d) Rodinia
Explanation: When Pangaea split, it divided into two parts: Laurasia in the north (including present-day North America, Europe, and Asia) and Gondwana in the south (South America, Africa, Antarctica, Australia, and India).
Q28) What was the southern part of Pangaea called?
a) Gondwana
b) Laurasia
c) Panthalassa
d) Eurasia
Explanation: Gondwana was the southern part of Pangaea that included South America, Africa, Antarctica, Australia, and India. It eventually broke into separate continents due to plate movements.
Q29) Which ocean surrounded the supercontinent Pangaea?
a) Pacific Ocean
b) Panthalassa
c) Tethys Sea
d) Atlantic Ocean
Explanation: The supercontinent Pangaea was surrounded by a massive ocean called Panthalassa. As continents drifted apart, Panthalassa broke into modern oceans, such as the Pacific and Atlantic.
Q30) Which modern theory is widely accepted as the correct explanation of continental movement?
a) Continental Drift Theory
b) Seafloor Spreading Hypothesis
c) Plate Tectonic Theory
d) Expanding Earth Theory
Explanation: Plate Tectonic Theory is the most widely accepted explanation of continental movement. It integrates Continental Drift and Seafloor Spreading concepts, explaining earthquakes, volcanic activity, and mountain formation accurately.
We hope these Different Theories on Continents GK Questions help you in your exam preparation. Keep practicing daily to strengthen your Geography knowledge.
👉 Check out more GK practice sets on our blog:
- [Continents GK Questions And Answers: Learn Geography Facts Easily – GK Practice]
- [Oceans Of World GK Questions And Answers – GK Practice]
- [World Rivers GK Questions And Answers – GK Practice]
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