The idea of epicycles was introduced by which astronomer as an attempt to explain the retrograde motion of the planets in the geocentric universe model?
a. brahe
b. galileo
c. ptolemy
d. copernicus

Nwhich situations is the principle of cross-cutting relationships useful in determining relative age? check all that apply. a fault breaks through sedimentary layers. sedimentary layers form and then are tilted. igneous rock forms between sedimentary layers. sedimentary layers form over millions of years in a lake bottom. lava flows form on top of one another from several eruptions over time.

Which period was the most rapid increase in urbanization in the eastern united states

Which government philosopher felt the people had a right to remove government officials should they not be supporting the rights of the people? question 1 options: john jacques rousseau john locke thomas paine charles montesquieu