Plate Boundaries And Characteristics And Volacnoes

Question 1

Conservative plate boundaries

Answer 1

Two plates slide past each other and move at different speeds and angles which become stuck. Pressure build up until plate breaks free.
-destructive earthquake
-san andreas fault
-northern and pacific plate

Question 2

Convergent plate boundaries

Answer 2

The plate that is less dense will be submerged under. When oceanic meets with continental the continental will be submerged.
-cause destructive earthquakes,tsunami and volcanoes
-peru-chile
- nazca and oceanic plate

Question 3

Divergent plate boundaries

Answer 3

Plates move wpart and magma will find gap between plates forming new crust.
-small earthquakes, small volcanoes
-iceland, mid atlantic-ridge

Question 4

Composite volcanoes

Answer 4

These are formed along convergent plate boundaries. They are steep sided, tall and conical shaped with a
narrow base. They are made of alternate layers of ash and lava. Andesitic lava is erupted from these volcanoes. It has a high silica
content making it more viscous so it flows slowly and travels short distances before cooling. Eruptions tend to be infrequent but
violent

Question 5

Shield volcano

Answer 5

These are formed along divergent plate boundaries and over hotspots. They are gently sloping domes with a
wide base. Basaltic lava is
erupted from shield volcanoes. It has a low silica content so it is less viscous meaning it is runny and flows long distances before
cooling. Eruptions tend to be frequent but gentle.

Question 6

Hotspot volcano

Answer 6

These are volcanoes that are formed away from plate boundaries. They are formed by a ‘plume’ of superheated rock
(not magma) rising slowly through the mantle. Once it reaches the upper mantle, it causes the asthenosphere and base of the
lithosphere to melt. The magma produced then rises through weaknesses in the crust and erupt at the surface. Oceanic hotspots erupt basaltic lava whereas continental hotspots erupt viscous lava

Question 7

Tsunami formation

Answer 7

Earthquake, volcano or landslide occurs onnocean floor. After is stress and releases water is displcaed upwards. Dissipates in all directions and quick and low in deep ocean, when reaching shallow water slows down and grows in height and gains energy