Page 104 - Science Course 2 (Book 2)

Mo10-L4a: What is Earthquake?

At divergent boundaries between oceanic plates, Key Concept
mid-ocean ridges form.
What is Earthquake?
Between continental plates, one side of the fault
moves down relative to the other side of the fault. How are landforms related to plate tectonics?

Normal faults form valleys at these boundaries.

PLATE

Asthenosphere

At subduction zones of convergent boundaries, the
plate that does not subduct deforms and crumples
as the two plates push toward each other.

As the mantle near the subducted plate melts, mag-
ma rises and forms a volcanic arc on the plate that
does not subduct.

At convergent boundaries with no subduction, the
edges of both tectonic plates become crumpled and
deformed.

Because neither plate subducts, blocks of crust
slide upward along a complex series of faults called
reverse faults. SUMMARY
What is Earthquake?
This results in the formation of tall mountains.
Interactions between plates cause the crust
to either spread apart and form valleys or to
deform and form mountains.

PLATE on a fault cause the crust on either side of the
Earthquakes occur when stresses or forces

fault to move.

Asthenosphere

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