1.8 Plate Boundaries

Question 1

Convergent Plate Boundary (Oceanic + Continental)

Answer 1

Eg Nazca and S America or Pacific + Eurasion. Fold mountains, volcanoes, ocean trenches and earthquakes are formed. The Andes Mountain Range was formed from this

Happen when oceanic crust goes below continetal crust

Question 2

Convergent Plate Boundary (Continental + Continental)

Answer 2

Eg Eurasion and Indo - Australian. Fold mountains, volcanoes and ocean trenches are formed. The Himilayes were formed from this

When 2 plates push towards each other moving the land upwards

Question 3

Divergent

Answer 3

Eg African and S American or Eurasion and N American. Shield volcanoes, sea floor spreading and ridges happen. The Mid Atlantic Range was formed from this

When the 2 plates are moving away from each other, releasing magma and as it cools new land is formed

Question 4

Conservative

Answer 4

Eg Pacific and N American. Volcanoes and faults form. The San Andreas fault in California was formed from this

When 2 plates grind against each other and friction builds up, then they split causing these to happen

Question 5

Composite Volcano

Answer 5

Convergent plate boundary. Made of lava + ash. High silica content - viscious. Lava flows short distance before cooling. Violent + frequent eruptions. Can have lava bombs + pyroclastic flows

Question 6

Shield Volcano

Answer 6

Divergent plate boundary. Low with gently sloping sides. Low silica content lave. Flows long distance before cooling. Eruptions are frequent but gentle

Question 7

Hotspot Volcano

Answer 7

Can happen in middle of plates. Mantle plumes - hot spots. When it reaches asthenosphere it melts lithosphere. Super heated rock, NOT magma. Plates move, creating island chains. Hawaii is a great example