EARTH'S ROCKY SURFACE CONTAINING THE CONTINENTS AND OCEAN FLOOR

THE IDEA THAT MANY KINDS OF ROCK FORM FLAT HORIZONTAL LAYERS

THE IDEA THAT A SUPER CONTINENT BROKE INTO OUR CONTINENTS

THE IDEA THAT NEW CRUST IS FORMING AT THE RIDGES

HOT MOLTEN ROCK BELOW EARTH'S SURFACE

THE IDEA THAT EARTH'S SURFACE IS BROKEN INTO PLATES

THE LAYER BENEATH EARTH'S CRUST

THE SLIDING OF A HEAVIER PLATE UNDER ANOTHER PLATE

A HUGE CRACK IN EARTH'S CRUST AT OR BELOW SURFACE

THE POINT WHERE AN EARTHQUAKE STARTS AS ROCKS SLIDE PAST THE OTHER

A VIBRATION THAT SPREADS OUT AWAY FROM A FOCUS

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

SHAKING OF EARTH'S CRUST AFTER THE INITIAL SHAKING OF A EARTHQUAKE

A DEVICE THAT DETECTS THE SHAKING OF EARTH'S CRUST

THE AMOUNT OF ENERGY RELEASED BY AN EARTQUAKE

THE OPENING IN A VOLCANIC AREA THROUGH MAGMA MAY ESCAPE

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

A CUP LIKE HOLLOW THAT FORMS AT THE TOP OF VOLCANO AROUND VENT

A VERY HOT PART OF A MANTLE

STEEP SIDED CONE THAT FORMS FROM EXPLOSIVE ERUPTIONS OF HOT ROCKS

A WIDE GENTLY SLOPED CONE THAT FORMS FROM FLOWS OF LAVA

CONE FORMED FROM EXPLOSIVE ERUPTIONS OF HOT ROCKS, FLOWS OF LAVA

HEAT FROM BELOW EARTH'S SURFACE