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Bryant Pond rocks!

posted Oct 28, 2014, 7:03 AM by Jotham Oliver   [ updated Oct 28, 2014, 8:21 AM ]

Since Hawaii is experiencing some massive geological events right now, we reviewed the three types of rocks: sedimentary, metamorphic, and igneous. Students were introduced to the following terms:

intrusive rocks ones that are formed under the surface (magma) 
-cools slowly
-coarse grained
-crystalline shaped

extrusive, ones that are formed at the surface (lava)
-cools quickly
-fine grained
-lack of crystals or none at all

With plate tectonics:
Divergent Boundary: plates pushing away.

Convergent Boundary: plate pushing towards each other causing a subduction zone.

-flux melting-water cooling the magma less dense rocks rise to the top

Types of volcanoes- 
    Cinder cones- small and explosive
    Shield Volcano-very wide and short, very thin, low viscosity
    Eruptions are quiet
    example of this: Kilauea 

Fissure-crack in the ground and lava comes out of it.

Stratovolcano (aka composite)
    -tall and wide

Caldera-a collapsed magma chamber that creates a crater inside the volcano walls after an eruption

BP 10/28




GOPR0032 ‎(Converted)‎.mov