Japan and New Zealand are examples of strings of volcanic islands known as .

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

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.