What do we currently believe was the main source of the Earth's ...

[captainjonesify]

What do we currently believe was the main source of the Earth's oceans and atmosphere?
 
  A) impacts by icy planetesimals
  B) outgassing by volcanoes
  C) material directly accreted from the solar nebula
  D) melting and vaporization of polar glaciers

Question 2

In a series RLC circuit the total impedance
 
  A) equals R + XL + XC.
  B) never exceeds R.
  C) always exceeds R.
  D) never is less than R.

[AaaA]

Answer to Question 1

B

Answer to Question 2

D

[captainjonesify]

Wow, this really help

[bulacsom]

Thanks for the timely response, appreciate it