7. What are the similarities between these surface features? What does this suggest about the possibility of water on Mars? 8. Scientists who disagree with the hypothesis that the Martian channels were caused by flowing water often point out that it is not clear where the water comes from, or where it goes. In the US Rivers image, the waters of the Mississippi River flow from the top of the image in a number of tributaries that combine to form the river that flows off into the Gulf of Mexico at the bottom of the image. Examine the Mars Channels. Which direction (N, NE, E, SE, S, SW, W, NW) is downhill? How do you know? Part 4: Giant Planets Look at the images of the outer Gas Giant Planets. 9. How are the outer (Jovian) planets different from the inner terrestrial planets? Give at least four differences. 10. The bands and stripes on Jupiter, Satum and Neptune are common to all planets with atmospheres. On the Earth, these bands are trade winds (westward surface winds), and jet streams (eastward high-altitude winds). On the Earth, and Venus, the energy that drives the winds comes from the Sun, which heats the ground and the lower atmosphere, starting the process of convection. However, Jupiter, Saturn, Uranus and Neptune have no "ground", and are much too far from the Sun for their winds to be "solar-powered". Where does the energy to drive these winds come from? .

1. 7. What are the similarities between these surface features? What does this suggest about the
possibility of water on Mars? 8. Scientists who disagree with the hypothesis that the Martian
channels were caused by flowing water often point out that it is not clear where the water comes
from, or where it goes. In the US Rivers image, the waters of the Mississippi River flow from the
top of the image in a number of tributaries that combine to form the river that flows off into the
Gulf of Mexico at the bottom of the image. Examine the Mars Channels. Which direction (N,
NE, E, SE, S, SW, W, NW) is downhill? How do you know? Part 4: Giant Planets Look at the
images of the outer Gas Giant Planets. 9. How are the outer (Jovian) planets different from the
inner terrestrial planets? Give at least four differences. 10. The bands and stripes on Jupiter,
Satum and Neptune are common to all planets with atmospheres. On the Earth, these bands are
trade winds (westward surface winds), and jet streams (eastward high-altitude winds). On the
Earth, and Venus, the energy that drives the winds comes from the Sun, which heats the ground
and the lower atmosphere, starting the process of convection. However, Jupiter, Saturn, Uranus
and Neptune have no "ground", and are much too far from the Sun for their winds to be "solar-
powered". Where does the energy to drive these winds come from?