The meteorites that strike Earth are:
A) pieces of comets that fall to Earth.
B) mostly made of iron.
C) the oldest rocks known.
D) the remains of the planet between Mars and Jupiter.
E) material from outside our solar system.
Question 2
On average, how fast do the plates move on Earth?
A) about 1 mile per hour
B) a few kilometers per year
C) a few centimeters per year
D) a few millimeters per century