Why is dissolved rock important in rivers and oceans

Can someone me with this plz? ! i'm putting 20 points on it!

Select the correct answer.look at this nineteenth-century illustration of london. which explanation best relates this illustration to changes in britain in the 1800s? a.factory workers in cities lost their livelihood because of the lack of housingb.industrialization narrowed the inccome gap between landowners and workers.c.the migration of workers from rural to urban areas resulted in overcrowded citiesd.the spread of railways allowed farmers to sell produce far from where it was grown.

Which of the following is a characteristic differentiating tropical and temperate rainforests? a. the location b. the types of trees c. the average temperature d. all of the answers are correct