GS One‑Liners
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5107
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Latest facts first
| # | Question & Answer |
|---|---|
| 3401 |
Who proposed the Continental Drift Theory?
-
Alfred Wegener (in 1912).
|
| 3402 |
Which layer of the Earth is responsible for the Earth's magnetic field?
-
The Outer Core.
|
| 3403 |
Which layer of the Earth is in a liquid state?
-
The Outer Core.
|
| 3404 |
Why is the Inner Core solid?
-
Due to immense pressure.
|
| 3405 |
What is the discontinuity between the solid inner core and the liquid outer core called?
-
Lehmann Discontinuity.
|
| 3406 |
What is the discontinuity between the core and the lower mantle called?
-
Guttenberg Discontinuity.
|
| 3407 |
What is the discontinuity between the upper and lower mantle called?
-
Repetti Discontinuity.
|
| 3408 |
What is the sharp boundary between the Crust and the Mantle called?
-
Mohorovick’s Discontinuity (or Moho Discontinuity).
|
| 3409 |
What are the two types of crustal portions?
-
Oceanic and Continental.
|
| 3410 |
What is the upper mantle material called?
-
Magma.
|
| 3411 |
What is the weaker zone in the Mantle from which molten rock material finds its way to the surface?
-
Aesthenosphere.
|
| 3412 |
Which layer of the Earth is the largest by volume?
-
The Mantle.
|
| 3413 |
What are the main mineral constituents of the Oceanic Crust?
-
Silica and Magnesium (called 'sima').
|
| 3414 |
What are the main mineral constituents of the Continental Crust?
-
Silica and Alumina (called 'sial').
|
| 3415 |
Which layer of the Earth is called 'NiFe'?
-
Core (mainly Nickel and Iron).
|
| 3416 |
What is the general density trend of the earth's layers as one goes down?
-
Density of material goes on increasing.
|
| 3417 |
What is the approximate thickness of the crust on the ocean floors?
-
Only 5 km.
|
| 3418 |
What is the approximate thickness of the crust on continental masses?
-
About 35 km.
|
| 3419 |
Which layer of the Earth is the thinnest of all the layers?
-
The Crust.
|
| 3420 |
What is the uppermost layer over the earth’s surface called?
-
The Crust.
|
| 3421 |
What are some direct sources of information about Earth's interior?
-
Volcanic eruptions, hot springs, rocks, deep drillings, deep mines.
|
| 3422 |
What are some indirect sources of information about Earth's interior?
-
Earthquakes, gravitation, magnetic field, and meteors.
|
| 3423 |
What are the forces that work on the surface of the earth called?
-
Exogenic forces.
|
| 3424 |
What are the forces that act in the interior of the earth called?
-
Endogenic forces.
|
| 3425 |
What two elements is the Earth mainly made up of?
-
Iron, followed by Oxygen.
|