QUICK REVIEW… Layers of the Earth

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Presentation transcript:

QUICK REVIEW… Layers of the Earth Crust (2 types) Mantle Outer Core Inner Core Earth’s crust and the very top of the mantle form the lithosphere Lithosphere sits on top of the asthenosphere

WHAT DO WE MEAN WHEN WE SAY “EARTH’S HISTORY?” Study Jams Slide Show: How did all of these things happen? http://studyjams.scholastic.com/studyjams/jams/s cience/rocks-minerals-landforms/landforms.htm

HOW???

LAW OF UNIFORMITARIANISM Law of Uniformitarianism- the idea that Earth is an always changing place The same forces of change are at work today that were at work in the past. Some changes are gradual; some changes are fast.

T-CHART: SLOW CHANGES VS. FAST CHANGES

SOME THINGS HAPPEN SLOWLY, WHILE OTHERS HAPPEN QUICKLY, BUT WHAT THEY BOTH HAVE IN COMMON IS THAT IT IS MOVEMENT THAT CAUSES THESE CHANGES…BUT MOVEMENT OF WHAT???? HINT:

TECTONIC PLATES The Lithosphere broken into many large and small slabs of rock called tectonic plates and where two plates meet, a lot of changes can occur.

How do the tectonic plates move? They move because of convection currents. The hot, soft rock in the mantle rises…then it cools, and sinks. How do the tectonic plates move?

There are 3 types of plate boundaries TECTONIC PLATES 1. Divergent 2. Convergent 3. Transform There are 3 types of plate boundaries

DIVERGENT Please TURN to back of paper  Key word: Divide

DIVERGENT

DIVERGENT Mid-ocean ridges Rift valleys Earthquakes Volcanoes What occurs at this boundary? New Crust Forms Mid-ocean ridges Rift valleys Earthquakes Volcanoes

CONVERGENT Key word: Collide 3 types of convergent: Continental-continental Oceanic-oceanic Oceanic- continental

CONVERGENT: CONTINENTAL-CONTINENTAL

CONVERGENT: CONTINENTAL-CONTINENTAL What occurs at this boundary? High mountains Earthquakes

CONVERGENT: OCEANIC-OCEANIC

CONVERGENT: OCEANIC-OCEANIC What occurs at this boundary? Deep-ocean trenches Volcanic islands Earthquakes

CONVERGENT: OCEANIC- CONTINENTAL

CONVERGENT: OCEANIC- CONTINENTAL What occurs at this boundary? Deep-ocean trenches Coastal mountains Earthquakes

TRANSFORM Key word: Slide

TRANSFORM

TRANSFORM What occurs at this boundary? Faults Earthquakes

BUT WHAT ABOUT SUBDUCTION? What is Subduction? When one plate sinks under another plate CAN ONLY HAPPEN… Continental & oceanic plate collide = oceanic plate ALWAYS sinks because it is more DENSE. Oceanic & oceanic plate collide = the older more dense plate sinks!

PLATE MOTION SIMULATION http://www.sepuplhs.org/middle/iaes/students/si mulations/SEPUP_Plate_simulation.swf

HOMEWORK Find a real world example for each type of boundary to fill in the last column of the chart…you may also include a printed picture Vocabulary Set 1 – Day 1