In paragraph 2, why does the author include the information that 105 tons of water flow through the Amazon river per second? A. To emphasize the great size of the volume of water that seems to have flowed through Mars' outflow channels B. To indicate data used by scientists to estimate how long ago Mars' outflow channels were formed C. To argue that flash floods on Mars may have been powerful enough to cause tear-shaped "islands" to form D. To argue that the force of flood waters on Mars was powerful enough to shape the northern volcanic plains