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