There are still 350 isolated indigenous groups in what section of

the Americas?

A. North America

B. Central America

C. South America

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons

Read the article about the fraser river, one of the most important rivers in canada. what is the most important species of fish in this river? why are the numbers of these fish declining?