The layers of earth's atmosphere are separated by which of the following?
a. cloud bands
b. different types of gases
c. changes in temperature trends
d. sudden differences in air pressure

Alaina wants to decide whether her current cell phone plan is better than a package that another company offers. to compare the two plans, she plotted two lines on a graph, where y represented the total cost of one month’s service and x represented the megabytes of data that she used in a month. which part of the graph will represent the cost per megabyte of data used in each plan?

Soil is made of air water organic material minerals weathered rock

Select the sentence from the section "father inspired her belief in education" that is most relevant to the central idea of the article.