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
11
In the context of plate tectonics, where are oceanic plates positioned relative to the Earth's interior?
Answer:
lower in the mantle
Oceanic plates are composed of dense basaltic rock. In the context of mantle convection and subduction, they are often described as sinking or residing deeper within the mantle compared to the more buoyant continental crust. Note: This terminology is simplified; plates are technically part of the lithosphere.
12
Which type of plate boundary is characterized by neither the creation nor the destruction of lithospheric material?
Answer:
passive plate boundary
A passive or transform plate boundary occurs where two tectonic plates slide past each other horizontally. Unlike divergent boundaries, where new crust is created, or convergent boundaries, where crust is destroyed through subduction, transform boundaries involve conservative movement where lithosphere is neither created nor consumed.
13
How do convection currents within the Earth's interior influence the movement of tectonic plates?
Answer:
plates
Convection currents in the Earth's mantle are driven by heat from the core. This heat causes the semi-molten rock to rise, cool, and sink, creating a cycle that exerts force on the lithospheric plates above, causing them to move across the asthenosphere.
14
What type of tectonic plate is the Nazca Plate?
Answer:
Oceanic Plate
The Nazca Plate is a major tectonic plate located in the eastern Pacific Ocean basin off the west coast of South America. Because it is composed primarily of dense basaltic rock and lies beneath the ocean, it is classified as an oceanic plate, which subducts beneath the South American continental plate.
15
In geological terms, how are the Himalayan mountain ranges classified?
Answer:
very young
The Himalayas are classified as young fold mountains. They were formed relatively recently in geological time due to the ongoing tectonic collision between the Indian Plate and the Eurasian Plate, a process that continues to elevate the range today.
16
What is the term for the large sections of the Earth's lithosphere that lie beneath the world's oceans?
Answer:
Oceanic Plates
Oceanic plates are tectonic plates that consist primarily of oceanic crust. These plates are denser and thinner than continental plates. They are constantly being created at mid-ocean ridges and recycled back into the mantle at subduction zones, playing a critical role in the theory of plate tectonics and the movement of the Earth's surface.
17
The Earth's lithosphere is composed of which of the following?
Answer:
major and minor plates
The Earth's outer shell, the lithosphere, is fragmented into several large tectonic plates, known as major plates, and numerous smaller ones, known as minor plates. These plates move over the semi-fluid asthenosphere, driving geological activity.
18
Which scientific theory explains that the Earth's outer shell is composed of several large, moving segments?
Answer:
plates
Plate Tectonics is the scientific theory describing the large-scale motion of the plates making up Earth's lithosphere. The lithosphere is broken into several tectonic plates that glide over the ductile asthenosphere, causing geological phenomena such as earthquakes, volcanic activity, mountain building, and oceanic trench formation.
19
What do the South American and African tectonic plates consist of?
Answer:
ocean beds and land both
Most major tectonic plates, including the South American and African plates, are composed of both continental crust (land) and oceanic crust (ocean beds). The South American plate includes the continent of South America and a significant portion of the western Atlantic Ocean floor, while the African plate includes the African continent and surrounding oceanic crust.
20
During the convergence of oceanic and continental tectonic plates, what is the destination of the subducting oceanic plate?
Answer:
mantle
When an oceanic plate collides with a continental plate, the denser oceanic plate is forced beneath the lighter continental plate in a process called subduction. The subducting plate descends into the Earth's mantle, where high temperatures and pressures cause it to melt, often contributing to volcanic activity and seismic events.