6.4

Question 1

what is plate tectonics (or continental drift)

Answer 1

it is the process of the earth’s crust which is broken into 8 segments or plates that move at a rate of 15 cm per year. this movemement is caused by of currents deep within the mantle.

Question 2

Pangaea:

• defintion of word
• and what it is itself

Answer 2

• it’s greek and means “all lands”

- what it is a large supercontinent that included all of our current continents. and included 2 main areas

Question 3

Gondwanaland-

Laurasia-

Answer 3

• Australia, Antartica, Africa, India and South America
• Acronym=AAAIS
• Asia, Europe, Greenland and North America
• Acronym= AGEN

Question 4

• covergent plate boundary
• divergent plate boundary
• transform plate boundary

Answer 4

• push towards each other
• Push away
• push past each other

Question 5

whats a collision zone

Answer 5

when 2 plates made of continental crust move towards one another. {(they create a collision zone.) not nessasary}

Question 6

whats a fold mountain

and example

Answer 6

• when neither plate can sink beneath the other, their crusts crumple upwards to form fold mountains.
• the Himilayan mountains

Question 7

explain why deep sea trenches occur near destructive plate margins

Answer 7

• they occur where plate margins made of heavy oceanic crust moves towards a plate consisting of lighter continential crust. (The heavier crust is forced down under the lighter crust creating a deep sea trench)

Question 8

where does a constructive plate margin occur

Answer 8

where 2 plates move away from each other magma rises from the mantle to form new oceanic crust. (This creates a line of underwater volcanoes which is called the mid ocean ridge.)