Underground caverns and porous layers of sand, gravel or rock in which groundwater is stored are called:

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

Under which condition below would u expect a coarse-grained intrusive rock like diorite to form?

East asia’s is dominated by dry highlands and grasslands. a. north and east c. north and west b. south and east d. south and west