EARTH'S SOLID,ROCKY SURFACE

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

THE IDEA THAT A SUPERCONTINENT SPLIT APART INTO PIECES

THE IDEA THAT NEW CRUST IS FORMING AT RIDGES IN THE SEA FLOOR

EARTH'S SURFACE IS BROKEN INTO PLATES THAT SLIDE ACROSS THE MANTLE

THE LAYER BENEATH EARTH'S CRUST

SLIDING OF A DENSER OCEN PLATE UNDER A PLATE WHEN THEY COLLIDE

HUGE CRACK BELOW THE SURFACE THE SIDES, SHOW EVIDENCE OF MOTION

THE POINT WHERE AN EARTHQUAKE STARTS

A VIBRATION THAT SPREADS OUT AWAY FROM A FOCUS

THE POINT ON EARTH'S SURFACE DIRECTLY ABOVE THE FOCUS

SHAKING OF EARTHS CRUST AFTER THE INITIAL SHAKE OF AN EARTHQUAKE

A SENSITIVE DEVICE THAT DETECTS THE SHAKING OF EARTH'S CRUST

THE AMOUNT OF ENERGY RELEASED BY AN EARTHQUAKE

THE CENTRAL OPENING IN A VOLCANIC AREA WHICH MAGMA MAY ESCAPE

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

A CUPLIKE HOLLOW THAT FORMS AT THE TOP OF A VOLCANO

A VERY HOT PART OF THE MANTLE

HOT ROCKS BUILT UP INT A STEEP SIDED CONE

LAVA SPREAD OUTAND HARDENED INTO A WIDE, FLAT MOUND

A CONE FORMED FROM EXPLOSIVE ERUPTIONS OF HOT ROCKS AND LAVA

HEAT FROM BELOW EARTH'S SURFACE

HOT AND MOLTEN ROCK BELOW EARTH'S SURFACE