Deep within the jungles of mexico and guatemala lie most of the mayan ruins.

true

false

What school are you from and what state are you from?

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?

Describe the four major spheres of the earth system; identify the parts of the earth they each represent. explain what is meant by the "earth system."