The daily rising and setting of the stars is caused by
a. the rotation of the earth on its axis
b. the revolution of the earth about the sun
c. the tilt of the earth
d. the seasons

gold discovery in california, and pioneer settlers were sometimes pulled west because they wanted to make a better living. others received letters from friends or family members who had moved west. these letters often told about a good life on the frontier. the biggest factor that pulled pioneers west was the opportunity to buy land.

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