hazards stuff

Question 1

who proposed continental drift

Answer 1

wegener

Question 2

what was Pangea

Answer 2

Pangea is what the world looked like before all the islands move apart.

Question 3

what evidence is there to support continental drift

Answer 3

native fossils and plant species are found at the coasts of corresponding continents
looks like everything fits together
corresponding lithology in different areas

Question 4

why do hotspots go against wegener

Answer 4

because the occur in the middle of the plate. This means that not all tectonic hazards happen at plate boundaries

Question 5

divergent meaning

Answer 5

constructive boundary

Question 6

convergent

Answer 6

destructive boundary

Question 7

ocean ridges

Answer 7

the magma pushes up the ends of the plate boundary due to the pressure (mid Atlantic ridge)

Question 8

what is the tall part of a rift valley called

Answer 8

the horst

Question 9

what is the short part of a rift valley called

Answer 9

the graben

Question 10

EARS ?

Answer 10

East African rift system

Question 11

rift valleys

Answer 11

the asthenosphere is soft and malleable and the crust isn’t so when pulled apart the crust splinters and some pieces sink into the mantle(like if you pull apart a curly whirly) EARS

Question 12

what boundary and plates are seen at an ocean ridge

Answer 12

constructive and 2 oceanic plates

Question 13

what boundary and plates are seen at a rift valley

Answer 13

constructive and 2 continental plates

Question 14

ocean trenches

Answer 14

when the oceanic plate subjects beneath the continental plate the continental may get wedged dragging is down causing a trench

Question 15

what boundary and plates are seen at an ocean trench

Answer 15

destructive subduction and an oceanic and a continental

Question 16

what is a hotspot

Answer 16

radioactive decay leads to energy being released creating super hot areas in the mantel. if a plate stays still for long enough it will burn through the crust creating volcanoes (New Zealand) not very common

Question 17

where can you find fold Mountains

Answer 17

destructive subduction boundaries or collision boundaries (Himalayas)

Question 18

why can fold mountains be found at subduction zones

Answer 18

because it the continental plate gets stuck it can buckle upwards causing a fold

Question 19

how do island arcs form

Answer 19

the denser oceanic plate subducts into the mantle. this causes rapid melting of the rock and the new magma to rise and melt through the overlying plate.

Question 20

what dictates the type of magma

Answer 20

the proportions of silica

Question 21

what dictates the type of volcano

Answer 21

the type of lava