C is your answer :)
And also C and D are true but its C.
This question is on Yahoo Answers
Answer: Uranium mining does not cause air pollution.
Explanation:
The hot air when come to close cold air forced to increase its speed
Which makes monsoon and also thunderstorm perform
Given the age of the meteorite is 4.5 billion years old with 78 atoms of lead-206 the answer should be B. 156. The half-life of uranium-238 in order to decay into lead-206 is 4.46 billion years, which means that the original number of atoms is 156.
