structure of earth

Question 1

state the 3 layers that the structure of earth is broken down to

Answer 1

-core
-mantle
-crust

Question 2

explain where the core is

Answer 2

-its the name given to the centre of the earth

Question 3

characteristics of the core

Answer 3

-extremely hot, with temperatures up to 5500degrees
-inner core has properties like a solid
-outer core acts like a liquid
-composed of metals (nickel + iron), so heavy

Question 4

where is the mantle found

Answer 4

-the middle section of the earth and has 4 differnt sections

Question 5

characteristics of the mantle

Answer 5

-upper mantle is solid as its furthest away from the core so is the coolest
-upple mantle forms the lithosphere

Question 6

where is the crust found

Answer 6

above the mantle

Question 7

what is the crust

Answer 7

the outer layer of the earth and is between 6 and 70km thick
-its a solid layer of rock and is reffered to as the lithosphere

Question 8

name the 2 types of crust

Answer 8

-oceanic
-continental

Question 9

what is the oceanic crust

Answer 9

-covered by water, so very dense
-younger rock
-thin, ranging from 6-20km thick
-largely composed of basalt and is very dense

Question 10

what is continental crust

Answer 10

-the land
-older rock
-ranges from 20-70km thick
-crust is composed of granite so is less dense than oceanic

Question 11

explain what the lithosphere is

Answer 11

-the solid outer part of earth
-it includes the brittle upper portion of the mantle and crust

Question 12

state the name of the place where plates meet

Answer 12

plate boundaries

Question 13

slab push,,,,,

Question 14

state what tectonic hazards are

Answer 14

earthquakes and volcanic erruptions that take place where plate margins meet

Question 15

state 3 types of plate margins

Answer 15

-destructive
-constructive
-conservative

Question 16

what is destructive plate margins

Answer 16

1. where 2plates are moving towards each other
2. oceanic plate meets a continental plate and the denser oceanic plates subducted and destroyed
3. VOLCANOS OCCUR HERE

where 2 continental plates meet, the ground is folded upwards creating fold mountains

Question 17

what is a constructive plate margin

Answer 17

-where 2 plates are moving away from each other

-magma rises from the mantle to fill the gap and cools creating new crust

Question 18

whats a conservative margin

Answer 18

-where 2plates are moving sideways past each other
or are moving in the same direction

Question 19

what type of plate margins do volcanoes occur

Answer 19

-destructive
-constructive

Question 20

where do earthquakes occur

Answer 20

at all 3 types, caused by the tension that builds up