TECTONIC HAZARDS Volcanoes at HOTSPOTS.

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Presentation transcript:

TECTONIC HAZARDS Volcanoes at HOTSPOTS

In this lesson you will discover : (I) The reason why some volcanoes do not occur on plate boundaries. (II) What happens to volcanoes located over a hotspot as they are carried away by the tectonic plate.

Study the distribution of volcanoes shown on Figure 2. Where is Kilauea located? Kilauea is located in the middle of the Pacific Ocean far from plate boundaries. 2 minutes

Extinct volcanoes Underwater volcano

Why? You are going to watch a short video on the formation of hotspot volcanoes. 1- Study activity 1 on the Hotspots worksheet. 2- Watch and listen! 3- Watch the video again to complete your answers! 5- Discuss your answers with the student seated beside you. 10 minutes

A few key words to help you VIDEO Stationary: which doesn’t move. Motion=movement Intrusion: Magma slowly pushes up from deep within the earth into any cracks or spaces it can find. Mantle Plume: A column of hot rock rising inside the mantle Solid part of the mantle Semi-molten part of the mantle (magma) An extinct volcano is not expected to erupt again.

Time to share your answers

active boundaries chain changes direction erosion erupts extinct hot interior melts moves new plume seamounts stationary underwater upwards

Figure for activity 2