Tiny products of volcanic eruptions may remain aloft in the ...

[kwoodring]

Tiny products of volcanic eruptions may remain aloft in the atmosphere for
 
  A) up to six months.
  B) up to three years.
  C) about ten years.
  D) about fifteen years.

Question 2

A grain size of 0.1 millimeter typically requires a wind speed of ________ in order to be picked up.
 
  A) 1 kilometer per hour
  B) 5 kilometers per hour
  C) 8 kilometers per hour
  D) 15 kilometers per hour

[snackralk]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: B