tectonics 1.1

Question 1

what does the lithosphere consist of?

Answer 1

crust and uppermost mantle

Question 2

what is the internal structure of the earth?

Answer 2

earth has a layered structure consisting of the core, mantle and crust

Question 3

what is the asthenosphere?

Answer 3

mantle below lithosphere.

Question 4

what happens in divergent plate boundaries

Answer 4

where plates move away from each other

Question 5

What happens in convergent plate boundaries?

Answer 5

where plates move towards each other

Question 6

transform plate boundary

Answer 6

where plates slide past each other

Question 7

what does the plate tectonic theory state?

Answer 7

-earth has a three layered structure(cm2c)
-earth’s lithosphere is broken up into huge pieces called tectonic plates
-plate movements result in formation of land forms for examples oceanic trenches and mountain ranges and phenomena like earthquakes and tsunami.

Question 8

where is the position of the core

Answer 8

inner most

Question 9

where is the position of the mantle

Answer 9

between the core and crust

Question 10

where is the position of mantle

Answer 10

outermost

Question 11

what is the temperature range for core

Answer 11

4400-6000 degrees

Question 12

temperature of mantle

Answer 12

1000-3700 degree

Question 13

temperature of crust

Answer 13

lowest

Question 14

thickness of core

Answer 14

thickest at 3300km

Question 15

thickness of mantle

Answer 15

2900km

Question 16

thickness of crust

Answer 16

thinnest, 3-70 km

Question 17

what are the two forces responsible

Answer 17

convection current and slab pull force

Question 18

process of convection current

Answer 18

-heat from earth’s core causes mantle to become less dense
-it then rises towards surface.
-rising convection current spreads he plates and drag them apart causing plate movement
-mantle material then loses heat and sinks towards core.
-material gets heated up again and process repeats.

Question 19

process of slab pull force

Answer 19

-when 2 plates converge, the denser oceanic crust is pulled down by gravity as it subducts beneath less dense crust.
-denser oceanic crust sinks deeper into the mantle under its own weight, pulling the rest of the plate with it, contributing to further convergence.

Question 20

6 major tectonic plates

Answer 20

african antartic eurasian, north american, south american. india australia

Question 21

two types of crust and its characteristics

Answer 21

continental crust
-makes up land masses
-light granite rocks
-less dense

oceanic crust
-makes up sea floor
-heavy basaltic rocks
-more dense

Question 22

major continental plates

Answer 22

south america
north america
australian
african
eurasian

Question 23

major oceanic plates

Answer 23

pacific
philippine
nazca