Please help y’all I don’t understand

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

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.