Valles Marineris is a A) large valley on the Moon. B) vast ...

[hubes95]

Valles Marineris is a
 
  A) large valley on the Moon.
  B) vast plain on Mars.
  C) huge series of cliffs on Mercury.
  D) large canyon on Mars.
  E) large canyon on Venus.

Question 2

The Dynamo Theory holds that
 
  A) lightning plays a major role in generating our magnetic fields.
  B) any other planet of similar density will also have a strong magnetic field.
  C) the Earth's core, like Mercury's, is now a solid, rigid bar magnet.
  D) magnetic fields are generated by rapidly spinning, fluid magnetic interiors.
  E) the Earth's magnetic field must switch polarities every few million years.

[cloud]

Answer to Question 1

D

Answer to Question 2

D

[hubes95]

TYSM

[amcvicar]

Excellent