Which of the following statements about geographic boundaries is false?
A.

Geometric boundaries can lead to conflict when they cross or ignore obvious physical boundaries.
B.

Natural physical forms can create boundaries between states.
C.

Physical boundaries follow straight, geometric boundary lines.
D.

Lines of longitude and latitude are used to calculate straight boundary lines

C,is false.

Explanation:

Physical boundaries don't have to be straight. For example most mountain ranges have a curve in the direction. Rivers and other water bodies also curve and not go straight. All the other answer choices are true.

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d) iowa i believe is the answer

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.