Valerie creates a model using three different rocks. The rocks are classified as igneous, metamorphic, and sedimentary. Which property does Valerie use for classification purposes?

color
formation
shape
texture

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.

What factors of japan’s geography make it necessary for it to import so many goods?

Which of the following regions suffers the most from acid rain? a. the area around vancouver c. the area below atlanta b. the area below detroit d. the area above montreal