Fog forms when?
a. warm air meets cold air
b. cold air meets warm air
c. warm moist air cools below its dew point
d. all of these

Are you going to give an example of the plant or?

Adialysis unit requires 78.5 l of water.the estimated digit is 5. 

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.