What is the degree of inclination in the orbital planes of the Earth and the Moon?

What do the two stars near the center of this block represent?

a) location of the earthquake
b) the star at depth is the place where the earthquake is generated
c) the star at depth is the hypocenter
d) the star on the surface is the epicenter
e) All of the Above

Which of the following layers of the earth is unique among the terrestrial planets?

Who propounded the Nebula hypothesis theory in relation to the origin of the earth?