Earths surface consists of about ____ tectonic plates. Plates are pieces of the ____ (crust and uppermost mantle) that fit together like puzzle pieces. ____ is the movement of lithospheric plates. Heat from Earth’s inner layers drives ____ currents. The radioactive decay of isotopes in Earths core that releases energy that continues to warm earth is called ____ Heat. While ____ Heat is the earth today continues to cool and release energy from its core as a result of the forces that created it. Heat from the core rises to the surface, passing through the mantle, and dissipates at earths surface. the heat creates ____ within the mantle. Plates move at a rate of about ____ year. There are three types of ____ boundaries. In ____ boundaries hot ____ rises, it stretches out the lithosphere, and fractures (rifts) the surface, forming a ____. In ____ boundaries colliding edges of the continental plates collide, buckle, and form ____. ____ is the process in which the oceanic plate slides beneath continental crust. When two adjacent plates, slip and grind past one another they form ____ boundaries. An example include ____ in California. An ____ is what happens when two blocks of the earth suddenly ____ one another. The surface where they slip is called the ____ or fault plane. The location below the earth’s surface where the earthquake starts is called the ____, and the location directly above it on the surface of the earth is called the ____. Sometimes an earthquake has ____. These are smaller earthquakes that happen in the same place as the larger earthquake that follows. The largest, main earthquake is called the ____. Mainshocks always have ____ that follow. These are smaller earthquakes that occur afterwards in the same place as the mainshock. Depending on the size of the mainshock, aftershocks can continue for weeks, months, and even years after the mainshock! The earth has four major layers: the ____ core, outer core, ____ and crust. Earth is made up of many pieces like a puzzle covering the surface of the earth that keep slowly moving around, sliding past one another and bumping into each other. We call these puzzle pieces ____, and the edges of the plates are called the ____.

Plate Tectonics

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