After seeing a flash of lightning, if one counts the seconds ...

[danielfitts88]

After seeing a flash of lightning, if one counts the seconds before hearing the thunder, one can estimate the distance to the flash. How many seconds delay
 
  (a) per mile?
  (b) per kilometer?

Question 2

In searching for life in the solar system, which basic requirement of life is the most fundamental and the one we always look for?
 
  A) the presence of organic matter
  B) the presence of an energy source
  C) the presence of a liquid medium, most likely water
  D) the presence of oxygen

[brittiany.barnes]

Answer to Question 1

(a) 5. seconds per mile
(b) 3. seconds per km

Answer to Question 2

C

[danielfitts88]

YES! Correct, THANKS for helping me on my review

[samiel-sayed]

Thanks for the timely response, appreciate it