The imaginary lines highlighted on the map travel from north to south and are used to measure distance from the prime meridian. they are
a.
lines of latitude
b.
lines of longitude
c.
date lines
d.
time zone lines

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years