2. PLATE TECTONICSTogether, the crust and the plates The theory
of plate tectonics claims make up lithosphere, the solid that the
Earths plates are always in motion. surfaces of the earth.
3. TY PE S OF PL A TE S B OU N DA R IE
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4. The Geologic TimescaleIt took fossilsand rock layersto
develop thegeologictimescale,which assignsnames anddates
todifferent timesin the Earthshistory.
5. Methods of relatives datingGeologistsUsed a methodcalled
relativedating toconstruct thegeologictimescale.
