The hard, rigid .......... that form the outermost portion of the earth are about 100 kilometers thick.
plates
The rocks of the .......... (mantle / crust / surface / layer) are composed mostly of minerals with light elements.
crust
The crust and upper mantle that form the surface plates are called the .......... (raft / asthenosphere / lithosphere / currents)
lithosphere
A weak, plastic layer of the lower mantle called the .......... (layer / plate / surface / asthenosphere)
asthenosphere
An expert in or student of geology is a ..........
geologist
Pangaea is a .......... (supercontinent / plate movement / land areas / modern continents)
supercontinent
Gondwanaland is a fragment of Pangaea located in the .......... (north / south / east / west)
south
North America tore away from Europe, forming the northern .......... Ocean.
Atlantic
A sudden and violent shaking of the ground, sometimes causing great destruction is an ..........
earthquake
The edge of the .......... Ocean has been called the "Ring of Fire".
Pacific
According to the passage, the lithospheric plates are given support by the .......... (upper mantle / crust / asthenosphere / ocean floor)
asthenosphere
a strong, hard magnetic silvery-gray metal, much used as a material for construction and manufacturing is an ..........
iron
Laurasia is a fragment of Pangaea located in the .......... (north / south / east / west)
north
sodium is an example of .......... (light / heavy) elements.
light
magnesium is an example of .......... (light / heavy) elements.
heavy
What is the synonym of a "boat"?
raft
