Earth Science Topography Maps

Question 1

At a transform boundary, two plates ___, moving in opposite directions, which often causes earthquakes. Crust is neither created nor destroyed.

Answer 1

slip past each other

Question 2

At a convergent boundary, two plates move ___ or converge (collide).

Answer 2

together

Question 3

two oceanic plates collide - the most dense oceanic plate (coolest plate which is furthest from the mid-oceanic ridge) sinks under the other oceanic plate at a ___ (subduction zone; pulled into the mantle and melted)

Answer 3

deep-ocean trench

Question 4

an oceanic plate collides with a continental plate – the ____ plate (more dense) sinks under the ____ plate at a deep ocean trench (subduction zone)

Answer 4

oceanic

continental

Question 6

two continental plates collide – neither plate is dense enough to sink into the mantle, so the crust is squeezed into mighty ___.

Answer 6

mountain ranges

Question 7

At a divergent boundary, two plates move ___, or diverege

Answer 7

apart

Question 8

___ is where the sea-floor is spreading occurs

Answer 8

mid-ocean ridge

Question 9

___ where two continental plates diverge

Answer 9

rift valley

Question 10

Two examples of divergent boundaries are:

Answer 10

a. mid-ocean ridge

Question 11

two continental plates collide – neither plate is dense enough to sink into the mantle, so the crust is squeezed into mighty ___.

Answer 11

mountain ranges

Question 12

At a divergent boundary, two plates move ___, or diverege

Answer 12

apart

Question 13

___ is where the sea-floor is spreading occurs

Answer 13

mid-ocean ridge

Question 14

___ where two continental plates diverge

Answer 14

rift valley

Question 15

Two examples of divergent boundaries are:

Answer 15

a. mid-ocean ridge
b. rift valley

Question 16

Three kinds of plate boundaries are

Answer 16

1. divergent, 2. convergent, 3. transform

Question 17

The theory of plate tectonics explains —

Answer 17

the formation, movement and subduction of Earth’s plates.

Question 18

The teary of plate tectonics states that

Answer 18

pieces of Earth’s lithosphere (crust) are in slow, constant motion, drive by convection currents in the mantle

Question 19

In 1965, J. Tuzo Wilson combined sea-floor spreading, Earth’s plates, and continental drift into a single theory called the theory of __.

Answer 19

plate tectonics

Question 20

Like a cracked eggshell, Earth’s lithosphere (crust) is broken into irregular separate sections called __

Answer 20

plates

Question 21

How did the matching magnetic stripes on each side of the mid-ocean ridge support the theory of sea-flooring spreading?

Answer 21

as molten material containing iron rolls and hardens, the iron lines up with the Earht’s magnetic pole, so the floor has been spreading from the ridge

Question 22

What information was provided by drilling into the sea floor to obtain rock samples and how did this support the theory of sea-floor spreading?

Answer 22

the age of the rocks were determined; the rocks farther away from the mid-ocean ridge were older than the rocks near it

Question 23

What is a deep-ocean trench?

Answer 23

deep under-water canyon

Question 24

What is subduction?

Answer 24

the process by which ocean floor sinks beneath a deep-ocean trench and back into the mantle