Plate Tectonics, Volcanos, & Earthquakes

Question 1

lithospheric

Answer 1

crust

Question 2

Rigid lithospheric plates “float” on top of

Answer 2

the semimolten asthenosphere

Question 3

amount of plates

Answer 3

7 major plates; 8 minor plates

Question 4

The plates move due to

Answer 4

CONVECTION CELLS within the
asthenosphere

Question 5

divergent boundaries

Answer 5

plates are moving apart

Question 6

CONVERGENT BOUNDARIES

Answer 6

End of one plate forced under another

Question 7

TRANSFORM BOUNDARIES

Answer 7

Plates slide by one another without
producing or destroying crust

Question 8

Intraplate volcanism

Answer 8

hot spots

Question 9

More viscous lava

Answer 9

difficult
to flow and traps gas –rhyolitic

Question 10

Less viscous

Answer 10

flows
more easily and gas can escape – basaltic (mafic) magma

Question 11

Shield volcanoes

Answer 11

broad, shallow slopes, basaltic magma (low viscosity)

Question 12

Composite volcanoes (violent eruptions)

Answer 12

steep-sided, alternating layers of lava/pyroclastics, highly viscous magma

Question 13

tephra

Answer 13

rock fragments

Question 14

source of energy in earthquakes

Answer 14

focus

Question 15

rocks bend and store

Answer 15

ELASTIC ENERGY

Question 16

Frictional resistance holding rocks together is overcome

Answer 16

SLIPPAGE takes place at the weakest point

Question 17

Slippage allows deformed rock to “snap back”, vibrations
result from

Answer 17

ELASTIC REBOUND