Give a brief account of some signs that indicate that there has been water on the Martian surface

What will be an ideal response?


Several types of formations hint that there has been water on the Martian surface. Outflow channels on the Martian surface appear to have been cut by massive floods carrying as much as 10,000 times the volume of water flowing down the Mississippi River. Such floods apparently swept away landscape features and eroded deep channels. The number of craters formed on top of the outflow channels shows that they are billions of years old.Valley networks look like meandering river beds that probably formed over long periods. The valley networks are located in the heavily cratered southern hemisphere.There are many other signs that indicate that there has been water on the Martian surface, some of which are geologically recent. The regions of collapsed terrain on Mars appear to be places where subsurface water has drained away. Gullies leading downhill appear to have been eroded recently, judging from their lack of craters, and a few gullies have been seen to appear between one Martian year and the next. In 2015, the Mars Reconnaissance Orbiter made spectroscopic observations confirming present-day seasonal groundwater flows.

Physics & Space Science

You might also like to view...

In order to produce beats, the two sound waves should have

A) the same amplitude. B) slightly different amplitudes. C) the same period. D) the same frequency. E) slightly different frequencies.

Physics & Space Science

What is the mass density of argon gas at pressure 1.00 × 105 N/m2 and at temperature 300 K? The mean atomic mass of argon is 39.948 g/mol and the ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K

A) 1.00 kg/m3 B) 1.40 kg/m3 C) 1.80 kg/m3 D) 1.60 kg/m3 E) 1.20 kg/m3

Physics & Space Science

Lillian safely touches a 100,000-volt Van de Graaff generator. Although the voltage is high, the relatively small amount of charge means a relatively small amount of

A) energy transfer. B) electric field. C) polarization. D) conduction.

Physics & Space Science

If the current through a circuit of constant resistance is doubled, the power dissipated by that circuit will

A) quadruple in magnitude. B) double in magnitude. C) decrease to one-half of what it was. D) decrease to one-fourth of what it was.

Physics & Space Science