The source of the earth's magnetic field is the:
a. sun
b. moon
c. oceans
d. core

Nuclear experimentation is a major global issue that affects relationships between countries. describe why countries try to limit the testing of nuclear weapons.

What does 2[tex] {2}^{ - 4} \times {2}^{ - 2} [/tex]

Which movement developed in the early 1900s and encouraged the nationalist spirit of africans throughout the world? a. african nationalist b. tribalism c. pan-africanism d. african union