Do you think your ecological footprint is smaller or larger than the 24 acres
that is average for the US? explain.

What was the great rift valley formed by

What border separates sonora and chihuahua national border state border physical boundary natural boundary

Which of the layers of the earth has the following three characteristics? i. it is a solid outer layer. ii. it is between 3 and 30 miles thick. iii. it is separated into plates. a. the outer core b. the inner core c. the mantle d. the crust