The Crust The crust is broken into large pieces that move slowly. These are called plates. These plates move because of temperature differences.

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Presentation transcript:

The Crust The crust is broken into large pieces that move slowly. These are called plates. These plates move because of temperature differences inside the Earth. http://safeshare.tv/w/ezHiPpXRhb © LoveLearning 2014

Convergent Boundaries CONVERGE = to come together Convergent Boundaries – when two plates come together and push against each other, they form mountains! http://sepuplhs.org/middle/iaes/students/simulations/SEPUP_Plate_simulation.swf © LoveLearning 2014

Divergent Boundaries DIVERGE = to move apart Divergent boundaries - when two plates move apart. This mostly happens in oceans, and they form volcanoes. http://sepuplhs.org/middle/iaes/students/simulations/SEPUP_Plate_simulation.swf © LoveLearning 2014

Transform Boundaries Transform Boundaries – when two plates slide past each other A large amount of energy is built up as boundaries slide past each other, and this often causes earthquakes http://sepuplhs.org/middle/iaes/students/simulations/SEPUP_Plate_simulation.swf © LoveLearning 2014

The Earth’s Layers are like an… © LoveLearning 2014

Structure of the Earth http://safeshare.tv/w/qhMpgkxknR Extra Links http://www.brainpop.com/science/earthsystem/earthsstructure/ http://www.brainpop.com/science/earthsystem/platetectonics/ © LoveLearning 2014

Earthquakes When the plates slide past each other, huge rocks that form at their edges shift with great force, which creates a crack in the Earth’s crust An earthquake is caused by a break in the rock that makes up Earth’s crust. This is called a fault. http://www.iknowthat.com/mhscience/Earthquakes/Fixed.htm © LoveLearning 2014

Earthquakes are both destructive and constructive! Earthquake Activity Earthquakes are both destructive and constructive! © LoveLearning 2014

Earthquakes are Constructive: A fault line in the Earth’s crust can be the location of a new landform. An earthquake can push one side up causing a fault scarp. © LoveLearning 2014

Earthquake Activity When an earthquake shifts the rock at a fault, a section of land can be moved several feet up, or a mountain range can be raised a few inches. Did you notice this guy? © LoveLearning 2014

Changes Caused by Earthquakes Earthquakes occur when the Earth’s crust shifts at a fault Pieces of one side of a fault can be pushed up in relation to land on the other side The faults form large trenches and cliffs on the Earth © LoveLearning 2014

Earthquakes http://www.pbs.org/wnet/savageearth/animations/earthquakes/index.html http://www.brainpop.com/science/earthsystem/earthquakes/ © LoveLearning 2014

Volcanoes In the Earth’s mantle, there are pockets of hot, liquid-like rocks and gases called magma. As heat and pressure builds up in these pockets (chambers) the gases expand. © LoveLearning 2014

Volcanoes The increasing pressure forces the magma up the volcano’s pipe and out the opening of the volcano (crater). Once the magma reaches the surface of the Earth it is called lava. Once all the pressure is released, the volcano stops erupting. http://kids.discovery.com/games/pompeii/pompeii.html © LoveLearning 2014

Volcanic Activity Volcanoes are both constructive and destructive forces that change the Earth’s surface. © LoveLearning 2014

Constructive They can “add to” the landforms of mountain ranges and… © LoveLearning 2014

Volcanic Activity create islands in the middle of the ocean. © LoveLearning 2014

© LoveLearning 2014

Hawaii’s Kilauea Volcano This volcano has been erupting continuously since January 1983. Lava is pouring down the edge of the island and into the ocean, becoming solid rock. Land is being added here! © LoveLearning 2014

Hawaii’s Kilauea Volcano This “new land” has been growing and extending the edge the Hawaiian Islands and into the ocean each year. © LoveLearning 2014

Effects of Volcanoes and Earthquakes Scientists cannot control volcanic eruptions and earthquakes However, they can warn people when they believe they are most likely to occur © LoveLearning 2014

Predicting Earthquakes and Volcanoes Devices called seismographs can detect vibrations during an earthquake. Seismologists study seismic waves The record made by a seismograph is called a seismogram http://www.teachersdomain.org/resource/ess05.sci.ess.earthsys.seismograph/ http://www.scholastic.com/browse/article.jsp?id=4892 © LoveLearning 2014

Using Science and Technology to Keep People Safe Seismographs also help scientists predict when tsunamis and volcanoes will occur Tsunami – a huge wave caused by an earthquake under the ocean Seismographs watch for underwater earthquakes to predict when one will occur http://www.whoi.edu/home/interactive/tsunami/indexEnglish.html © LoveLearning 2014

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