That Earth ____ , evidence that Earth differentiated.
a. rotates slowly
b. has an average density that is higher than the density of the crust
c. has a no magnetic field
d. has a surface that is 75 water
e. all of these
Question 2
The rotation curve of the galaxy provides evidence for the existence of the ___________________ _ which extends beyond the halo of the galaxy.
Fill in the blank(s) with correct word