tectonic theory

Question 1

continetial crust characteristics

Answer 1

• thick
• old
• lighter
• granite, silicon, aluminum and oxygen

Question 2

oceanic crust characteristics

Answer 2

• thin
• younger
• heavier
• basalt, silicon, magnesium

Question 3

convection currents

Answer 3

core generates high temperatures which heats the lower mantle

Question 4

gravitational sliding

Answer 4

lithosphere thickens with distance from mid ocean ridge because it cools

Question 5

landforms associated with palte movements

Answer 5

• ocean ridges
• rift valley
• deep sea trenches
• island arcs
• fold mountains

Question 6

ocean ridges

Answer 6

continuous uplift feature on surface
- it breaks the surface creating an island
- space between two plates is filled with lava

Question 7

rift valley

Answer 7

plates move apart on land
- east africa moving away from african continent

Question 8

deep sea trenches

Answer 8

oceanic and continental plates meet
- denser oceanic plate submerges creating a trench

Question 9

island arcs

Answer 9

decedning plate into hot subduction zone creates friction
- less dense material rises as magma surfaces and forms volcanoes along tectonic boundaries

Question 10

fold mountains

Answer 10

continental plates meet and sediment pushes up
- some material forms deep roots
- andes mountains

Question 11

global distribution of tectonic hazards

Answer 11

clear patterns of volcanic and seismic activity along north/south america or in atlantic ocean
- ring of fire

Question 12

constructive plate margin

Answer 12

plates move away from each other and magma rises in the gap
shield volcanoes
- sea floor spreading (oceanic)
- rift valley

Question 13

destructive plate margin

Answer 13

plates move towards each other
one plate subducts (oceanic)
- ocean trench and fold mountains
- composite volcanoes

Question 14

conservative plate margins

Answer 14

plates move alongside eachother
oceanic conservative causes tsunamis
- fault lines
- earthquakes