4.26.18

 

Hello,

Today in class we learned more about seafloor spreading. We made a model of the ocean floor and learned about how magnetic stripping provides evidence for seafloor spreading.

model

We also wrote a class summary about seafloor spreading and worked a little on vocabulary.

Continental drift: the hypothesis that the continents slowly move across Earth’s surface

Pangaea: The name of the single landmass that broke apart 200 million years ago and gave rise to today’s continents

Mid Ocean Ridge: an undersea mountain chain where new ocean floor is produced; a divergent plate boundary

Deep Ocean Trench: a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle

Subduction: The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary

Seafloor Spreading: The process by which molten material adds new oceanic crust to the ocean floor

Tonight’s homework: Quiz tomorrow on continental drift and seafloor spreading! Complete vocabulary in your notebook and study guide provided. study guide plate 1

 

 

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6 responses to “4.26.18

  1. Ms. Saccoccio, what does it mean by why are there convection currents in the asthenosphere?

  2. Do we have to draw pictures were the open spaces are?

  3. i dont get the question on why are the part of the ocean floor no older then 200 million year old

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