Download Lesson 2/3: Movement of Tectonic Plates

SCIENCE 8
Plate Tectonics
NAME: ___________________________
BLOCK: ____ DATE: _________________
Lesson 2/3: Movement of Tectonic Plates
Goals:
-to describe why tectonic plates move (mantle convection)
-to explain how mantle convection occurs
-to describe what plate boundaries are and what happens when tectonic plates move
Key words: mantle, convection, plate boundaries, density, oceanic crust, continental crust, divergent plate
boundary, convergent plate boundary, transform plate boundary
WHY DO PLATES MOVE?
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Tectonic plates move due to mantle convection
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But what is convection?
Where is the water warmer and cooler?____________________________________________________
Why does the cooler water sink and warm water rise?__________________________________________
What happens to the wood blocks?________________________________________________
Define convection in your own words:
Mantle convection: Fill in blanks in the following using the above and the video to help
•
As the mantle changes temperature, it changes______________________. Hot mantle is
_____________________________and rises, while cooler mantle is
____________________________________and sinks.
•
This exchange creates a “__________________________________________” of mantle
•
As the mantle material moves, it drags the __________________________________with it.
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convection is caused by heat of __________________and__________________________ in mantle
What happens when plates move?
•
Tectonic plates (made of the___________________________________) move slowly and float on the
____________________________________(which flows like toothpaste)
•
Plates interact with each other at their edges, known as ____________________________________
Types of Boundaries
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There are three types of plate boundaries: convergent, divergent and transform
o Convergent plate boundary: formed when two plates ______________________________________
o Divergent plate boundary: formed when two plates ________________________________________
o Transform plate boundary: formed when two plates ________________________________________
------------------------------------------------------------------------------------------------------------------------------------------------Assignment1. Read pages 290 to 292 (in BC Science Connections) and complete the
following:
Describe the thickness and density of the two types of crust:
Oceanic
Continental
2. Complete the handout on the types of boundaries
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