Why is normal precipitation always slightly acidic? A) ...

[AEWBW]

Why is normal precipitation always slightly acidic?
 
  A) Precipitation dissolved carbon dioxide to form carbomic acid.
  B) Nitrogen fixing bacteria form nitric acids which evaporate into the atmosphere.
  C) Sulfur dioxide from volcanic explosions combines with water to form sulfuric acid.
  D) Chlorine, in the presence of sunlight and hydrogen, is converted to hydrochloric acid.

Question 2

Ocean sediment cores provide a climate record for the past ________ years.
 
  A) 800,000
  B) 2 million
  C) 10 million
  D) 70 million

[Dunkey]

Answer to Question 1

A

Answer to Question 2

D

[AEWBW]

Wow, this really help

[CAPTAINAMERICA]

Thanks for the timely response, appreciate it