Geography MCQs
Topic Notes: Geography
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
Which two continents are moving further apart due to the divergent movement of the African and American tectonic plates?
Answer:
America and Africa
The Mid-Atlantic Ridge is a divergent tectonic plate boundary located along the floor of the Atlantic Ocean. As the North American and South American plates move westward and the African and Eurasian plates move eastward, the seafloor spreads, causing the continents of America and Africa to gradually move further apart over geological time scales.
2
What feature is created when oceanic plates diverge at a tectonic boundary?
Answer:
a gap
At divergent plate boundaries, tectonic plates move away from each other. In oceanic settings, this movement creates a gap or rift, which is subsequently filled by upwelling magma from the mantle, leading to the formation of new oceanic crust and mid-ocean ridges.
3
How is the South American Plate classified in geological terms?
Answer:
Continental Plate
The South American Plate is primarily a continental plate, as it consists largely of the South American continent. While it does include a significant portion of the Atlantic Ocean floor, it is categorized as a continental plate because it carries the continental landmass.
4
Which two tectonic plates are responsible for the transform boundary movement beneath California?
Answer:
Pacific and North American Plate
The San Andreas Fault in California is a famous transform plate boundary. It marks the sliding contact between the Pacific Plate and the North American Plate, which move horizontally past each other, causing frequent seismic activity in the region.
5
What occurs when an oceanic plate converges with a continental plate?
Answer:
downwards
Due to the higher density of oceanic crust compared to continental crust, when these plates collide, the oceanic plate is forced beneath the continental plate in a process known as subduction. This movement pushes the oceanic plate downwards into the mantle, often resulting in deep-sea trenches and volcanic arcs.
6
Plate Tectonics primarily examines the dynamic changes occurring in which layer of the Earth?
Answer:
Crust
Plate Tectonics is the scientific theory describing the large-scale motion of the plates making up the Earth's lithosphere. These plates constitute the outermost shell of the Earth, known as the crust and the uppermost solid mantle.
7
What is the term for tectonic plates that consist of both continental landmasses and oceanic crust?
Answer:
Continental Plates
Tectonic plates are large segments of the Earth's lithosphere. While some plates are purely oceanic, many, such as the North American or Eurasian plates, are classified as continental plates because they contain significant continental crust in addition to oceanic crust. These plates are dynamic and move over the semi-fluid asthenosphere, driving geological activity at their boundaries.
8
Why do continental plates tend to sit at a higher elevation relative to the mantle compared to oceanic plates?
Answer:
higher on the mantle
Continental crust is composed primarily of granitic rocks, which are less dense than the basaltic rocks that make up oceanic crust. Because of this lower density and greater thickness, continental plates exhibit isostatic buoyancy, causing them to 'float' higher on the denser, semi-plastic mantle material.
9
Which of the following is a prominent example of a mid-oceanic ridge?
Answer:
mid-Atlantic ridge
The Mid-Atlantic Ridge is a classic example of a divergent plate boundary located along the floor of the Atlantic Ocean. It is a vast mountain range formed by tectonic plates moving apart, allowing magma to rise and create new seafloor.
10
What tectonic process led to the formation of Iceland at the junction of the North American and Eurasian plates?
Answer:
diverged
Iceland is situated directly over the Mid-Atlantic Ridge, a divergent plate boundary where the North American and Eurasian plates are moving apart. This divergence allows magma from the mantle to rise, creating new crust and forming the volcanic island of Iceland.