Lithospheric plates and movement

Question 1

Continental drift

Answer 1

fragmentation of Pangea and slow movement of continents away from it
proof - fossils, sedimentary rocks , fit of continents and young oceanic rock

Question 2

plate tectonics

Answer 2

movement of crustal plates as they move over the asthenosphere

Question 3

plate spreading/diverging

Answer 3

lowland region at diverging wursts makes Rift Valley

along mid oceanic ridge where new crust is formes king seafloor spread

Question 4

subduction

Answer 4

one plate is forced down into the asthenosphere where rocks are melted , magma mixes with lower crust material water and sediment on the surface of the subjecting plate
occurs with oceanic continual and oceanic-oceanic plates prone to earthquakes and volcanoes

Question 5

oceanic-continental plates

Answer 5

less dense continental plate overrides denser oceanic plate resulting in earthquakes and volcanoes

Question 6

oceanic - oceanic plates

Answer 6

densities are the same, deep trenches and large volcanoes

Question 7

continental-continenetal

Answer 7

the crust of the earth which is moving and colliding not much subduction but high relief causing earthquakes but not many valances

Question 8

lateral contact

Answer 8

two plates sliding past one another cause transform faults and earthquakes no major subduction or volcanoes

Question 9

isostasy

Answer 9

condition of equilibrium between floating landmasses ans the asthenosphere below them , buoyancy of landmasses compensates for erosion

Question 10

volcanoes

Answer 10

eruption of molten rock at the earths surface can occur at crustal spreading , subduction zones and interpolate boundaries

Question 11

types of volcanoes

Answer 11

active - erupted in recorded history
dormant - shows signs of recent activity but an eruption has not been recorded
extinct - shows no signs of life and exhibits long term weathering and erosion

Question 12

volcanic hazards - lava

Answer 12

magma that reaches and solidifies on earths surface , comes up from volcanic vent and turns into igneous rocks an d back down through metamorphic rocks

Question 13

volcanic bombs

Answer 13

projectile lava jabs that solidify as they fall back into the surface, basically getting exploded still somewhat liquid

Question 14

lahar

Answer 14

mudflow caused by volcanic eruption - hot lahar

mudflow caused by precipitation or melt on preexisting ash - cold lahar

Question 15

pyroclastic

Answer 15

rock nd lava fragmentos erupted explosively form a volcanoes , dangerous can contain cid gas filled lava
explode with no warning and can mix into the stratosphere and reach high altitudes

Question 16

ash

Answer 16

solid cider like fragemgs of lava material explode into air during an eruption carried long distances and can act as significantly large clouds

Question 17

fissure eruptions

Answer 17

unlike volcanoes with pipe shaped events fissure eruptions form form cracks in the lithosphere lava extends in sheets across the landscape - plateaus