Particulate matter A) are not a health concern due to the ...

[mpobi80]

Particulate matter
 
  A) are not a health concern due to the small size and relatively small effect on human health.
  B) is a mixture of fine particles that impact human health.
  C) has not yet been studied by scientists.
  D) is, by definition, larger than 100 microns.
  E) has not been associated with health risks.

Question 2

How are both positively and negatively charged particles able to form in the same thunderstorm cloud?
 
  What will be an ideal response?

[wilsonbho]

Answer to Question 1

B

Answer to Question 2

The freezing of liquid droplets is believed to lead to the separation of charges, ice crystals favoring a positive charge and liquid droplets favoring a negative charge.

[mpobi80]

Thanks for the timely response, appreciate it

[brbarasa]

Excellent