The predominant gas in the earth's atmosphere is

a.
helium

b.
oxygen

c.
methane

d.
water vapor

e.
nitrogen

:calculate the sum of the interior angles of a 13-sided polygon.

Why the moon is not visible from earth during the new moon ?

When geographers describe how two places are related to each other spatially, they are describing a. where the places are located in relation to one another b. what kinds of natural environments are around each place c. how each place is changing over time d. what kinds of cultures are in each place