The most striking and largest valley in the solar system is A) ...

[cabate]

The most striking and largest valley in the solar system is
 
  A) the Grand Canyon in Arizona.
  B) Gwenivere on Venus.
  C) the Discovery Scarp of Mercury.
  D) Valles Marineris on Mars.
  E) Valhalla on Callisto.

Question 2

The critical temperature to initiate the proton-proton cycle in the cores of stars is:
 
  A) 3,000 K.
  B) 5,800 K.
  C) 2,300,000 K.
  D) 10 million K.
  E) 100 million K.

[Chou]

Answer to Question 1

D

Answer to Question 2

D

[cabate]

Thanks for the timely response, appreciate it

[ultraflyy23]

YES! Correct, THANKS for helping me on my review