Select all that apply. The astrolabe must be level in order to read the properly.

degree scale
altitude
plumb bob
level

If x ≤ 25, which could be the perimeter of this rectangle? a) 100 in b) 155 in c) 225 in d) 750 in e) 1500 in

The earth's internal process which drives seafloor spreading is

Which are evidence of the seafloor spreading? a. molten material b. magnetic stripes c. continental material d. drilled core samples e. ocean water samples