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

Amountain is larger than a hill, with steep sides true or false

Why does sweden and norway have steep roofs

According to a recent survey, the local government wants to classify people according to their income earning capacity. they want to do so in order to provide special facilities for the poor. who among the four individuals will be classified as poor? a. joseph earns $2.25 per day b. maria earns $1.50 per day c. rosita earns $2.00 per day d. tim earns $ 1.00 per day