Question:Early in Earths history, the atmosphere was mainly composed of ammonia, methane, nitrogen, carbon dioxide, and helium. Today it is mostly composed of nitrogen and oxygen. What idea does this support about earth?

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Which statements about wells are true? check all that apply. a) wells bring groundwater from the unsaturated zone to the surface of the water. b) wells need to be drilled below the water table. c) if water is pumped from a well too quicky, the well may run dry. d) water from wells is generally not safe to drink. e) water gushes from artesian wells due to pressure.

The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.