Earth structure and Plate boundary movements

Question 1

What is the structure of the earth?

Answer 1

Question 2

2 types of crust?

Answer 2

Continental Oceanic

Less dense More dense

Thicker Less thick

Older Younger

Question 3

How is heat tranferred in the mantle?

Answer 3

Question 4

Constructive margin

Answer 4

• 2 plates move away from each other

↳ magma rises to fill the gaps

↳ this forms a new oceanic crust

Question 5

Conservative margin

Answer 5

• 2 plates slide past each other
• No crust is destroyed/formed → no volcanoes/ladforms
• Earthquakes can occur if plates ‘stick

↳ pressure builds, one plate jerks foreword, shockwaves

Question 6

Collision margin

Answer 6

• 2 continental crusts move together
• Continental crust cannot be destroyed

↳ rocks are forced upwards to create fold mountains collision zone, mountain roots

Question 7

Destructive margins

Answer 7

• Oceanic crust moves towards continental crust
• Collide, oceanic is forced down, forming subduction zone

↳ it melts due to heat and friction from the mantle and this new magma rises to form volcanoes

Question 8

Fold mountains

Answer 8

• Sea separates
• sediments settle on the sea floor → geosynclines

↳ compressed to sedimentary rocks

• 2 plates move towards each other
• Rock becomes crumpled and folded