Sturcture Of Earth & Plate Boundaries

Question 1

List all features of Earths structure starting from crust.

Answer 1

1. Crust
2. Asthenosphere
3. Mantle
4. Outer core
5. Inner core

Question 2

What are the crusts features?

Answer 2

• divided into plates

- two types of crust oceanic plate and continental plate

Question 3

What are the asthenosphere’s features?

Answer 3

• semi-molten

Question 4

What are the mantles features?

Answer 4

• from 1000 - 3700 degrees Celsius

-

Question 5

What is the outer cores features?

Answer 5

• is liquid

Question 6

What is the inner cores features?

Answer 6

• is solid

- up to 6000 degrees celsius

Question 7

Difference between continental crust and oceanic crust?

Answer 7

Continental crust is less dense than oceanic crust

Question 8

What do convection currents do?

Answer 8

Make the plates move

Question 9

How do convection currents make the plates move?

Answer 9

The rising hot material from the asthenosphere cools down and becomes dense enough so it sinks, this creates movement on the bottom of tectonic plates and causes them to move

Question 10

What are the three types of plate boundary?

Answer 10

• convergent
• divergent
• conservative

Question 11

What are convergent boundaries?

Answer 11

Convergent boundaries are when two plates are moving towards each other

Question 12

What are divergent boundaries?

Answer 12

Divergent boundaries are when two plates are moving away from each other

Question 13

What are conservative boundaries?

Answer 13

Conservative boundaries are when two plates are moving sideways past each other, or are moving in the same direction but at different speeds

Question 14

What happens when a continental plate meets a oceanic plate?

Answer 14

The oceanic plate goes down (sub-ducts) and melts into the mantle. The build up of tension between the plates causes earthquakes of different magnitudes. It can also cause ocean trenches where subduction takes place and volcanic eruptions because when the ocean trench melts it adds to the magma in the mantle and causes magma to rise eventually leading to a volcanic eruption.

Question 15

What happens when a two continental plates meet?

Answer 15

The ground is pushed up and creates mountains

Question 16

What happens at a divergent boundary?

Answer 16

The plates move away because of the convection currents from each-other and magma rises from the mantle to fill the gap and cools, creating new crust

Question 17

What happens at conservative boundaries?

Answer 17

Only earthquakes occur as the plates either move sideways past each-other or move in the same direction but at different speeds

Question 18

What is magma?

Answer 18

Magma is molten rock beneath the earths surface. When it appears above the surface it is lava.