1) earth is considered a system because all of its parts_.
a: represent separate closed systems
b: interact
c: where formed at the same time
d: are powered by the same energy source
2) what are the 2 sources of energy for the earths system?
a: lightening and the sun
b: the sun and the earths interior
c: the sun and wind
d: earths interior and wind
3) which of the following is not caused by human interactions with the earths system?
a: air pollution
b: water pollution
c: mountain building
d: deforestation