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The cryptoterrestrial hypothesis proposes that reports of flying saucers or UFOs are evidence of a hidden, Earth-based, technologically-advanced civilization. [1] [2]Aaron John Gulyas, a scholar of conspiracy theories, characterized the so-called hypothesis as "really more of a thought experiment designed to raise questions", while others note that "even people open to the cryptoterrestrial ...
Because the Earth's field vector is much stronger than the anomaly field, a modern magnetometer measures the sum of the Earth's field and the component of the anomaly field in the direction of the Earth's field. Sections of crust magnetized at high latitudes have magnetic vectors that dip steeply downward in a normal geomagnetic field.
The expanding Earth or growing Earth was a hypothesis attempting to explain the position and relative movement of continents by increase in the volume of Earth. With the recognition of plate tectonics in 20th century, the idea has been abandoned.
Before the concept of plate tectonics, global cooling was a geophysical theory by James Dwight Dana, also referred to as the contracting earth theory. It suggested that the Earth had been in a molten state, and features such as mountains formed as it cooled and shrank. [1] As the interior of the Earth cooled and shrank, the rigid crust would ...
Hollow Earth theory; The Open Polar Sea, an ice-free sea once supposed to surround the North Pole; Rain follows the plow – the theory that human settlement increases rainfall in arid regions (only true to the extent that crop fields evapotranspirate more than barren wilderness)
These Earth Day quiz questions and answers will help you learn more about the world around you.
A level expanse of this extent is quite incompatible with the idea of the Earth's convexity. It is, therefore, a reasonable proof that Earth is not a globe." [citation needed] "If the Earth were a globe, a small model globe would be the very best – because the truest – thing for the navigator to take to sea with him.
Theory of the Earth is a publication by James Hutton which laid the foundations for geology. [ 1 ] [ 2 ] In it he showed that the Earth is the product of natural forces. What could be seen happening today, over long periods of time, could produce what we see in the rocks.