Frost action is most effective ____. A)in high mountains B)where ...

[jparksx]

Frost action is most effective ____.
 A)in high mountains
 B)where the temperature rarely drops below freezing
 C)where Earth materials are permanently frozen
 D)where temperature has little fluctuation
 E)in low canyons

Question 2

Most of the productive coal beds of Paleozoic age are found in rocks formed during the ___________________ _ period.
 Fill in the blank(s) with correct word

[fdliggud]

Answer to Question 1

A

Answer to Question 2

Pennsylvanian

[jparksx]

Excellent

[jamesnevil303]

Gracias!