What makes trash more likely to end up in some areas of the ocean ?

a. toxins
b. currents
c. oil spills
d. upwelling

Which of there factors contributed most to us westward expansion in the second half of the nineteenth century?

What is associated with mid-ocean ridges?

The declining axolotl population in mexico city is an example of in overcrowded cities. a. the surpassing of support capacity b. changes to natural environments and native species c. the lack of safe homes and tenured spaces d. the effects of a growing urban heat island