What is a contour interval?

a. a loop formed by contour lines that indicates a peak or depression

b. the elevation difference between two adjacent contour lines

c. an imaginary line that joins points of equal elevation

d. the degree of a slope's steepness

B. The elevation difference between two adjacent contour lines

Explanation:

A contour interval is the vertical distance or difference in elevation between contour lines in topographical maps. A topographical map is a type of map that specifies in the large detail and quantitative representation of relief, usually using contour lines, contour intervals and many other methods.  

answer: researching and understanding issues being considered by lawmakers.

explanation:

lobbying is the act of attempting to influence a politician's behaviour. lobbyists can be members of a constituency, organizations, businesses, non-profit organizations or professional lobbyists.

the decreasing neutrality of the u. s. in world war i

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