bk+1+1.2

A. Plates

 * 1) ==Rocky outer shell of broken pieces that fit together.==
 * 2) ==More than 12 major plates==
 * 3) ==boundaries between plates are cracks in Earth's crust==

B. Plate Tectonics

 * 1) ==Earth's plates move ever so slowly in various directions==
 * 2) ==move slowly==
 * ==several cm/year==
 * ==mm/year==

4. Distance=speed x time
= = =1.2 Quiz=
 * 1) =Nazca=
 * 2) =Juan de Fuca=
 * 3) =290 meters=
 * 4) =9 cm=
 * 5) =Theory of plate tectonics states that the surface of the earth is divided into a number of sections which move slowly in relation to each other.=

=Study guide= = = =5. plates= =6. 25 meters= =14. year= =15. predict future changes= =26. outer layer=