Chapter 7 Vocabulary

Question 1

hypothesis that continents are in constant motion

Answer 1

continental drift

Question 2

naturally preserved remains,imprints, or traces of organisms

Answer 2

fossil

Question 3

middle layer of earth situated the crust above and the core below

Answer 3

mantle

Question 4

ancient supercontinent composed of land that forms today’s continents

Answer 4

pangaea

Question 5

event in which the magnetic field reverses direction

Answer 5

magnetic reversal

Question 6

mountain range located on the middle of the ocean

Answer 6

mid-ocean ridge

Question 7

conforming to a type standard, or regular pattern

Answer 7

normal

Question 8

today’s magnetic field; magnets orient themselves to point south

Answer 8

normal polarity

Question 9

magnetic field in which magnets orient themselves to point north

Answer 9

reversed polarity

Question 10

new oceanic crust forms at a mid-ocean ridge as old ocean crust moves away

Answer 10

seafloor spreading

Question 11

circulation of material caused by differences in temperature and density

Answer 11

convection

Question 12

where two plates collide

Answer 12

convergent plate boundary

Question 13

where two plates separate

Answer 13

divergent plate boundary

Question 14

cold, rigid outermost rock layer of Earth

Answer 14

lithosphere

Question 15

capable of being molded or changing shape

Answer 15

plastic

Question 16

theory that earth’s surface is made of rock plates that move with respect to each other

Answer 16

plate tectonics

Question 17

force created by rising mantle of ocean ridges that creates potential for plates to move away from the ridge

Answer 17

ridge pull

Question 18

force created by sinking of a plate, or slab, that pulls on the rest of the plate

Answer 18

slab pull

Question 19

sinking of the denser plate below a more buoyant plate at a convergent plate boundary

Answer 19

subduction

Question 20

where two plates slide by each other.

Answer 20

transform plate boundary