Chapter 11 plate tectonics

Question 1

moon “formation”

Answer 1

smaller planet “theia”, crashes into earth. merged but ejected much matter, eventually formed into moon.

Question 2

Atmosphere formation

Answer 2

gases emitted from volcanos

Question 3

ocean formation

Answer 3

water vapor from volcanoes condensed out of the atmosphere and gathered in low lying areas of the crust, making oceans.

Question 4

“age” of the earth

Answer 4

4.6 billion years

Question 5

relative age

Answer 5

the age of one thing compared to another without regard to how old either is

Question 6

absolute age

Answer 6

age specified in years before the present

Question 7

why is earths interior hot?

Answer 7

friction
asteroid bombardment
tidal forces
radioactivity

Question 8

earths interior layers

Answer 8

Crust
>lithosphere
Lithospheric mantle

asthenosphere
>mantle
lower mantle

outer core
>core
inner core

Question 9

Moho

Answer 9

the boundary that separates the crust from the lithospheric mantle

Question 10

two crusts

Answer 10

continental: granite
Oceanic: Basalt

Question 11

why is the lithosphere broken into plates

Answer 11

convection currents from the mantle move the plates

Question 12

Pangea

Answer 12

super continent 300 million years ago

Question 13

continental drift

Answer 13

theory by Alfred Wegner in 1912. Evidenced by matching rock types and glacial debris from different continents.

Question 14

average speed of plates

Answer 14

speed of fingernail growth

Question 15

plate bounderies

Answer 15

diverging (constructive)
converging (destructive)
transforming (conserving)

Question 16

three hot spots

Answer 16

Hawaii
Iceland
Yellowstone national park

Question 17

how is ushers video relevant to the quiz?

Answer 17

plate tectonics

Question 18

how many lithospheric plates?

Answer 18

14

Question 19

rifting

Answer 19

a place where continental crust is stretching and splitting

Question 20

accreted terranes

Answer 20

a mass of crust that is transported by plate movement and fused onto the margin of a continent

Question 21

anticline

Answer 21

a fold in the crust with an arc like ridge

Question 22

syncline

Answer 22

a fold in the crust with a u shaped dip