Author Question: Most of the dark regions on Mars visible from Earth are: A) features like the Valles Marineris. ... (Read 50 times)

tichca · **on:** Jul 27, 2018

Most of the dark regions on Mars visible from Earth are:

A) features like the Valles Marineris.
B) lava flows from active volcanoes.
C) mountainous regions.
D) the seasonal growth of vegetation on the planet.
E) volcanic planes like the lunar maria.

Question 2

The Ptolemaic model of the universe

A) explained and predicted the motions of the planets with deferents and epicycles.
B) is the basis of our modern cosmology.
C) could not account for the stellar parallax observed by Hipparchus.
D) describes the orbits of the planets as being ellipses, not circles.
E) always kept Mars and Mercury between the Earth and Sun.