EARTH'S SOLID, ROCKY SURFACE CONTAINING THE CONTINENTS AND OCEAN

THE IDEA THAT MANY KINDS OF ROCKS FORM FLAT, HORIZONTAL LAYERS

CONTINENTS SPLIT APART INTO PIECES WHICH DRIFTED OFF

A SPREADING APART THE CRUST ON OCEAN FLOOR

HOT MOLTEN ROCK BELOW EARTH'S SURFACE

IDEA THAT EATH'S SURFACE IS BROKEN INTO PIECES AND THAT ARE SLIDING

LAYER BENEATH EARTH'S CRUST

SLIDING OF A DENSER OCEAN PLATE UNDER ANOTHER PLATE WHEN COLLIDE

A HUGE CRACK IN EARTH'S CRUST

A POINT WHERE AN EARTHQUAKE STARTS AS ROCKS

A VIBRATION THAT SPREADS OUT AWAY FROM FOCUS WHILE AN EARTHQUAKE

POINT ON EARTH'S SURFACE DIRECTLY ABOVE THE FOCUS OF AN EARTHQUAKE

SHAKING OF EARTHS CRUST AFTER THE INITIAL SHAKING OF AN EARTHQUAKE

DEVICE THAT DETECTS THE SHAKING OF EARTH'S CRUST DURING EARTHQUAKE

AMOUNT OF ENERGY RELEASED BY AN EARTHQUAKE

CENTRAL OPENING IN A VOLCANIC AREA THROUGH MAGMA MAY ESCAPE

MAGMA THAT REACHES EARTH'S SURFACE AND FLOWS OUT OF A VENT

CUPLIKE HOLLOW THAT FORMS AT THE TOP OF VOLCANO AROUND THE VENT

VERY HOT PART OF THE SUN'S MANTLE

STEEP-SIDED CONE THAT FORMS FROM EXPLOSIVE ERUPTIONS

WIDE, GENTLY SLOPED CONE FORMS FROM FLOWS OF LAVA

A CONE FORMED FROM EXPLOSIVE ERUPTIONS OVER AND OVER

HEAT FROM BELOW EARTH'S SURFACE