The earths shape

Question 1

how many plate tectonics are there, what are there numbers and what are there names

Answer 1

1 - Eurasian Plate
2 - Australian Plate 
3 - Philippine Plate 
4 - North American Plate
5 - Pacific Plate  
6 - Cocos Plate 
7 - Caribbean Plate  
8 - Nazca Plate 
9 - Antarctica Plate 
10 - South American Plate 
11 - Scotia Plate 
12 - African Plate 
13 - Arabian Plate  
14 - Indian Plate 
15 - Juan de Fuca Plate

Question 2

what are the different sections of the Earth

Answer 2

1 - Inner Core
2 - Outer Core
3 - Mantle
4 - Crust

Question 3

describe the Earth’s size

Answer 3

• it’s 12 700 km in diameter
• it’s radius from the centre to the crust is 6 371 km
• the circumference on the equator is 40 075

Question 4

describe the Earth’s crust, include what it’s made from, temperatures and depths

Answer 4

• average thickness of Earth’s crust is 20 km
• thinnest parts below oceans = about 10 km deep
• thickest parts on continents, thickest parts on these crusts found amongst mountain ranges. with thickest having depth about 75 km
• different types rocks form crust. some layers from volcanic eruptions others from compressed layers
• temperature at lowest levels of crust is 1000 degrees Celsius.

Question 5

describe the mantle

Answer 5

• layer immediately below crust, extends about halfway towards centre of Earth
• layer made up of molten rock, magma
• closer to crust it is harder, closer to outer core it is softer

Question 6

describe the outer core

Answer 6

• below mantle

- made up of hot iron + nickel in liquid form

Question 7

describe the inner core

Answer 7

• inner most layer
• made up of iron + nickel
• despite temperatures between 5000 - 6000 *C it is solid due to extreme pressure

Question 8

what is divergence

Answer 8

hot magma in the mantle rises, pushing cooler magma away from it.

Question 9

what is convection

Answer 9

due to divergence the cooler magma later descends in the mantle, where it is reheated. this circular movement is referred to as convection

Question 10

what is convergence

Answer 10

the plates resting on mantle move as upper level of mantle moves, forcing plate edges to collide with each other

Question 11

what are the edges of plates referred to as

Answer 11

plate boundaries

Question 12

what happens when 1 plate rides another and what is this referred to as and what is a transform fault

Answer 12

when 1 plate rides on top of another it forces the 1 plate down. this is referred to as submergence. and a transform fault is when these plates move side ways.

Question 13

can you label, draw and identify divergent, convergent and transform movements

Answer 13

yes / no