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postnew [5]
3 years ago
6

Why did ptolemy have to introduce multiple circles of motion for the planets instead of a single, simple circle to represent the

planetâs motion around the sun?
Geography
1 answer:
jarptica [38.1K]3 years ago
8 0
<span>According to Ptolemic Model the Earth was considered to be at the center of Earth. All the planets, stars and moons were thought to be revolving around the Earth will be doing so in epicycles. The epicycles are spiral movement in which movement is given while forming circles and center in orbits around the Earth</span>
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Subduction zone and trench is formed

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When two tectonic plates that are comprised of oceanic crust shares a convergent type of plate boundary, then the denser one subducts below the less dense one. Due to this convergent plate motion, a subduction zone is created, which is marked by the presence of an oceanic trench. As the subducting plate penetrates downward into the deeper zone, the process of partial melting takes place, which leads to the melting of the crust and eventually the constituent minerals are mixed with the magma. This magma again comes upward due to the force exerted by the convection current and thereby results in the formation of volcanoes in the over-riding plate.

Thus, the collision of two oceanic plates gives rise to the formation of a subduction zone and a trench.

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