Topic Summaries

Key features of plate margins

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Earth layers and earthquakes

Tectonic plate margins

Responses to tectonic hazards

Hot desert ecosystems

Cold environment ecosystems

Destructive margins Constructive margins Conservative margins
Crust is destroyed in subduction zones New crust is created from magma No crust created or destroyed
Severe earthquakes Shallow earthquakes Powerful earthquakes
Explosive volcanoes with silica-rich magma Volcanoes with basaltic lava (runny, less explosive) No volcanic activity as no magma rises
Creates fold mountains and trenches Creates mid-ocean ridges Creates fault lines

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