Arny Chapter : #9QFR

8. Venus is so hot because of extremely strong runaway greenhouse effect. Venus has about 300,000 times more carbon dioxide than earth and so its greenhouse effect is much stronger.

12. Some of the surface features seen on Mars are that along the equator there is a rift, Vales Marines that runs for 4000km long, 100 km wide and 7km deep. There are also volcanoes, one which rises 25km called Olympus Mons. At the Martian poles there are immense deserts with dunes as well.

17. The evidence that leads some scientists to believe that life may have existed on Mars is that they have found places where liquid water was once present which is a critical ingredient for living organisms of almost any type.

Stimets Chapter : #7

QUES

3. The slow retrograde rotation of Venus might be explained by the tidal forces from Earth slowing down and even reversing a more rapid initial prograde rotation, also the planets dense atmosphere which rotates independently of the planet also in a retrograde direction but much more rapidly, with a period of 4 days.

6. Two ways that Mars is similar to Earth is that the length of days are 24.5 hours, and the axial tilt is 23.98 degrees (Earth is 23.45)