Moon Phases
#RockinReview

Key Terms:

*Waxing- when the moon is 50% full
*Waning- when the moon is less than 50% full
*Gibbous- more than half but less than full moon
*Crescent- the curved shape of a waxing/waning moon

When the moon is waxing it has a crescent on the right side and when it is waning it has a crescent on the left side.

Lunar Cycle:

The lunar cycle is the cycle of where the illuminated portion of the moon seen by people on earth changes. It is 29.53059 days long.

Plate Techtonics
#platetechtonics

Alfred Wegener

Alfred Wegener was the person who came up with the theory of Pangaea. Pangaea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras.

VOCAB:

Convergent-coming closer together, especially in characteristics or ideas.
Divergent-tending to be different or develop in different directions.
Transform Boundary-a strike-slip fault occurring at the boundary between two plates of the earth's crust.
Convection Currents: a current in a fluid that results from convection.
Rift Zone: a feature of some volcanoes, especially shield volcanoes, in which a linear series of fissures in the volcanic edifice allows lava to be erupted from the volcano's flank instead of from its summit.
Subduction Zone: the biggest smash-up on Earth, marking the collision between two of the planet's tectonic plates, the pieces of crust that slowly move across the surface over millions of years.

Juan de Fuca Plate is just off the coast of Washington.

It causes volacanoes in the Cascades.

Convection Currents:

Convection currents play a role in plate tectonics. "Large convection currents in the aesthenosphere transfer heat to the surface, where plumes of less dense magma break apart the plates at the spreading centers, creating divergent plate boundaries. As the plates move away from the spreading centers, they cool, and the higher density basalt rocks that make up ocean crust get consumed at the ocean trenches/subduction zones. The crust is recycled back into the aesthenosphere."

Channeled Scablands

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