Tectonic hazards

Question 1

What promoted the plate tectonics theory?

Answer 1

through observations, carbon dating and fossils continents once joined together(pangea). Floated apart in continental drift

Question 2

What is the plate tectonics theory?

Answer 2

Crust divided into solid tectonic plates

Question 3

What are the 2 types pf crustal plates

Answer 3

-oceanic plate
- Continental plate

Question 4

Describe the features of oceanic plate

Answer 4

Recently formed
thin and dense
formed of basalt(black lava flow)

Question 5

Describe the features of continental plate

Answer 5

Older
thicker and less dense
formed of granite

Question 6

What are the types of plate margins

Answer 6

constructive, destructive, conservative

Question 7

Describe what happens at a constructive margin

Answer 7

plates moving apart, magma forced to surface, as rises causes rocks to fracture triggering earthquakes, at surface magma escapes as lava forming volcanoes

Question 8

What plates are constructive margins between and an example

Answer 8

continental- mid atlantic ridge

Question 9

Why are volcanoes like at constructive plate boundaries?

Answer 9

-lava hotter at constructive plate boundaries so flows over long distance before cooling

Question 10

What is the end characteristics of volcanoes at plate boudaries

Answer 10

-shield volcanoes, flat, broad, non explosive

Question 11

Describe what happens at destructive plates boudaries

Answer 11

Oceanic crust subducted under continental, friction between plates causes earthquakes, magma pushed up anf form volcanoes

Question 12

What are volcanoes like at destructive plate boudaries

Answer 12

• viscous and think magma, composite volcanoes, tall and cpnical shape, violent and ash clouds

Question 13

Describe what happens at a conservative plate boundary

Answer 13

Plates move past each other, earthquakes when friction suddenly released

Question 14

name an example of a conservative plave boundary

Answer 14

san andreas fault