9 Questions
What is the main driving force of plate movement, according to the text?
Slab pull from the subduction of cold, dense slabs
What is the main reason why the idea of upwelling magma injections as a driving force is disregarded?
It does not reduce pressure on the underlying asthenosphere
What is the thickness range of continental plates?
50-75 km
What process extends and thins plates at divergent margins?
Partial melting due to reduced pressure on the asthenosphere
What are primary tectonic hazards?
Earthquakes and volcanoes resulting directly from tectonic activity
What is the key to understanding the spatial geography of earthquakes and volcanoes?
Plate tectonic movements
What happens at passive margins between different types of plates?
They are not seismically active
What is the composition of most tectonic plates?
A mix of oceanic and continental lithosphere
What is the physical state on which plates move?
'Slush' layer between upper mantle and lithosphere
Explore the spatial geography of primary tectonic hazards such as earthquakes and volcanoes. Understand how plate tectonic movements play a key role in the distribution of these hazards.
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