Plate Tectonics

Question 1

Lithosphere

Answer 1

.the rigid outer part of the earth

Question 2

Asthenosphere

Answer 2

.the upper layer of the earth’s mantle

Question 3

Mesosphere

Answer 3

.the region of the earth’s atmosphere above the stratosphere and below the thermosphere

Question 4

Inner Core

Answer 4

. is the Earth’s innermost part

Question 5

Outer Core

Answer 5

.a fluid layer about 2,300 k thick

Question 6

Seismic Waves

Answer 6

.an elastic wave in the earth produced by an earthquake

Question 7

Oceanic Crust

Answer 7

.the relatively thin part of the earth’s crust that underlies the ocean basins

Question 8

Continental Crust

Answer 8

.the relatively thick part of the earth’s crust that forms the large landmasses

Question 9

Density

Answer 9

.the degree of compactness of a substance

Question 10

Alfred Wegener

Answer 10

.German geophysicist who proposed the theory of continental drift

Question 11

Continental Drift

Answer 11

.the gradual movement of the continents across the earth’s surface

Question 12

Convergent Boundary

Answer 12

.a tectonic boundary where two plates are moving toward each other

Question 13

Divergent Boundary

Answer 13

. divergent plate boundary

Question 14

Transform Boundary

Answer 14

.type of boundary is one where the two plates slide against each other in a sideways motion

Question 15

Sea-floor Spreading

Answer 15

.the formation of new areas of oceanic crust

Question 16

Pangaea

Answer 16

.hypothetical supercontinent that included all current land masses

Question 17

Laurasia

Answer 17

. The supercontinent of the Northern Hemisphere

Question 18

Gondwana

Answer 18

.A vast continental area believed to have existed in the southern hemisphere

Question 19

Mesosaurus

Answer 19

.an extinct small aquatic reptile of the early Permian period

Question 20

Glossopteris

Answer 20

. greek word meaning tounge