Directions: Fill in the blanks with the right word/words from the box below.
Earth's ___ (1) is made up of layers, the _____ (2) and _____ (3) There are two types of crust: the _____ (4) known to be less dense continental crust and _____ (5) which is relatively thinner but _____ (6) than the continental crust. The entire lithosphere of the Earth is broken into numerous segments called _____ (7) plates is called _____ (8) The constant slow movement of these and takes an average rate of _____ (9) per year. One of the consequences of plate tectonics is _____ (10) It releases _____ (11). which travel at different velocities. Seismic recording stations use the time interval of arrival of the _____ (12) and _____ (13)
