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maks197457 [2]
3 years ago
15

This image shows the Rio Grande, a river that separates Texas and Mexico.

Geography
2 answers:
lianna [129]3 years ago
3 0
The answer is c physical
m_a_m_a [10]3 years ago
3 0
The Rio Grande is an example of a physical boundary, other examples exist where boundaries correspond with any rivers, mountains, deserts, or really any defining body of water. A cultural boundary would be the borders between countries or regions that also corresponds to differences in ethnicity, language, and cultural norms, a geometric boundary would be the border between countries without regard to physical boundaries, such as the US-Canada border, and religious boundaries would be state boundaries that also correspond to religious differences, such as between primarily Hindu India and primarily Muslim Pakistan. 
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Answer:

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Retrograde motion is an apparent change in the movement of the planet through the sky. Ptolemy's model of the solar systems was geocentric, where the Sun, Moon, planets and start all orbit the Earth in perfectly circular orbits. However this perfectly circular orbits around the Earth did not explain the occasional retrograde motion of the planets. In the Copernicus' heliocentric model, retrograde motion of planets is naturally explained. The explanation for retrograde motion in a heliocentric model is that retrograde occurs roughly when a faster moving planet catches up to and passes a slower moving planet.

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