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