Which of the following is considered a greenhouse gas?
a. argon
b. oxygen
c. nitrogen
d. water vapor

How much energy is made when a pice of wood burns. how do you know

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world