5.Energy from the inside of the earth makes the ground move.Which of the following is the reason why there is no movement right away?
A.there is no movement right away because of the bending of the rocks.
B.The rapid release of an energy causes the delay of the movement of the ground.
C.there is no movement right away because of the vibrations of the rocks.
D. Friction causes the delay on the movement of the ground.

6.When a fault suddenly moves,it generates____________.
A. An earthquake
B. a shaking
C. a line
D. none of these

7.As the waves reach the core, what kind of seismic wave disappears?
A. S-waves
B. P-waves
C. Rayleigh wave
D. love wave

8.The earth is divided into three main layers. Hot inner core:yellow; the molten outer core:orange;the mantle:red;thin crust:__________.
A. black
B. gray
C. brown
D. green​