Which of the following is true regarding the polar front jet stream
a. it sometimes requires airlines to allot more time traveling from the east to the west

b. it controls the movement of low pressure systems in north america

c. it is the boundary between cold polar air in the north and warm air to the south

d. all of the above are true

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

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?

What first caused people to consider that the continents were once one large landmass?