What type of mountains are formed when molten rock erupts onto earth's surface and hardens?

The african continent is home of the worlds largest desert and longest river . t or f

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?

5. what is a red giant? can our sun become a red giant? why or why not?