I need some help with my science homework. (only with a few questions) 1.) Explain how the temperature in the morning would make it a good idea to water your plants then.

2.) Explain how a snowflake might end up as groundwater.

3.) List the two parts of the water cycle that are responsible for forming:
A) Rivers: and
B) Clouds: and

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.