Answer:
<u>Geocentric Model</u>: - this model is Earth Centered
-Retrograde motion is explained by epicycles
<u>Heliocentric Model</u>: - This model is Sun Centered
-Retrograde motion is explained by the orbital speeds of planets
<u>Both models</u>:- Epicycles and deferents help explain planetary motion
-Planets move in circular orbits and with uniform motion
-The brightness of a planet increases when the planet is closest to Earth
Explanation:
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.
Answer: Sweden does not charge tuition for both public and private colleges. Denmark spends 0.6% of its total GDP on subsidies for college students. Finland also provides students with generous scholarships and grants to finance their studies or living expenses. Ireland has paid tuition fees for most full-time undergraduate students since 1995. Iceland tuition fees vary by your major because of differences in both the cost of studies and labor-market demands. Norway pays the most for college subsidies, spending 1.3% of its annual GDP. The Czech Republic provides small subsidies to help students with college costs aside from covering the cost of tuition.
Explanation:
Most plants live in the Epipalegic zone so your answer would be A
True, because the greatest populated areas would not be in the mountain rages.