Chapter 12 - Forces in the Earth - 6th grade

Front

Core

Back

Dense center of the earth made of solid and melted metals

Front

Mantle

Back

Layer of the earth that surrounds the core

Front

Crust

Back

Outer layer of the earth

Front

Continental Drift

Back

Theory that the major landmasses of the earth move

Front

Pangea

Back

Single landmass from which Alfred Wegener thought the continents separated millions of years ago.

Front

Sea-floor spreading

Back

Theory that the ocean floor spreads apart as new crust is formed at mid-ocean ridges

Front

Plate tectonics

Back

Theory that the earth's surface is made of large sections of crust that move

Front

Plate

Back

Large sections of the earth's crust that moves

Front

Convection Current

Back

Circular motion of a gas or liquid as it heats

Front

Volcano

Back

Mountain that develops where magma pushes up through the earth's surface