Bell ringer- How do plate tectonics keep Earth habitable? Earth is the only planet in the Solar System with plate tectonics. The outer crust of the Earth is broken up into regions known as tectonic plates. These are floating on top of the magma interior of the Earth and can move against one another. When two plates collide, one plate can go underneath another. This process is very important. When microscopic plants in the ocean die, they fall to the bottom of the ocean. Over long periods of time, the remnants of this life, rich in carbon, are carried back into the interior of the Earth and recycled. This pulls carbon out of the atmosphere, which makes sure we don’t get a runaway greenhouse effect, like what happened on Venus. Without the plate tectonics, there’d be no way to recycle this carbon, and the Earth would overheat.

notes on plate tectonics and heat transfer Evidence for Sea-Floor Spreading: Magnetic reversal—North & South poles switch Small grains of magnetic materials align with poles of Earth & harden in the rock as it cools When poles reverse, these small grains switch Earth’s magnetic field results from movement in the outer core

Review your notes/worksheets on Earth’s layers Quiz to follow

Ch 4 sec 3 page What are the different plate boundaries? 2.What force moves the plates? 3.How do scientists track plate movement?

Sent up notes Term Your Definition Picture example

Plate tectonics—plates that float on asthenosphere and move around Boundaries: Convergent (Together) (Mountains & subduction) Divergent (Apart) (Sea-floor spreading) Transform (Opposite) (Earthquakes) Plate tectonic rap

What is heat transfer?

Heat Transfer—heat moving from one place to another Conduction— heat transfer through solid materials (leaving a metal spoon inside a pan of soup) Convection currents— movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another (hot air balloon, heating soup in a pan) Radiation— heat transfer through empty space (sunlight, radiant heat, heat from oven)

Exit pass table quiz Study with your group

What’s popping Lab time! Lets review! What’s inside popcorn?

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