Page 145 - Science Course 2 (Book 2)

Mo11-L3b: Why Plate Tectonics Move?

Mo11-L3b Why Plate Tectonics Move? Let’s Begin

KEY CONCEPTS: Evidence for Plate Tectonics
1. How are earthquakes and volcanoes related to the
theory of plate tectonics? Scientists can measure how fast continents move
2. What causes convection? using a network of satellites called the Global
Positioning System.

Vocabulary A-Z Because plates are rigid, tectonic activity occurs
where plates meet.
Let us learn some vocabulary

convection
the circulation of particles within a material caused
by differences in thermal energy and density.

Volcanoes form where plates separate along a
ridge push
mid-ocean ridge or continental rift or collide along a
the process that results when magma rises at a subduction zone.
mid-ocean ridge and pushes oceanic plates in two
different directions away from the ridge.

slab pull
the process that results when a dense oceanic
plate sinks beneath a more buoyant plate along a
subduction zone, pulling the rest of the plate that
trains behind it.

ridge push slab pull

Mountains can form where two continents collide.
Ocean

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