Earth Hazards A hazard is anything which can cause harm to people. Earth Hazards are processes in the earth or on its surface which can cause harm. Three.

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Presentation transcript:

Earth Hazards A hazard is anything which can cause harm to people. Earth Hazards are processes in the earth or on its surface which can cause harm. Three hazards are volcanoes, earthquakes and soil erosion.

4C Revision Cone, Crater, Lava Flow A Cone is the shape of the volcano (a mountain with a circular base and a pointed top A Crater is a bowl shaped hollow at the top of the volcano A Lava Flow is the overflow path of molten magma, coming down the side of the cone from the crater. Cone Crater Lava Flow

4B Revision Four things thrown out of a volcano Volcanoes are places where the earth’s magma comes out at the earth’s surface. When a volcano erupts gas, and lava are ejected, plus rock from the crust. This rock can be fine dust or stones and boulders called ash. Fine dust will blow on winds for 1000’s of miles Invisible, poisonous gas is blown out of the vent Rocks of the broken crust are called ash. They fall back near the vent to build up as a cone. Bits of molten lava “rocket” into the air and fall back as “volcanic bombs”.

4b Revision (as 4c plus …) When two tectonic plates move together or apart the effects are that Earthquakes and Volcanoes are created. This volcano is on Hawaii. It is caused because two plates are moving apart and so let magma rush up from below the crust. When the magma flows out it is called lava. As the earth moves, earthquakes shake Hawaii

4a revision (as 4c and 4b plus..) Four effects of an earthquake are: 1.Roads are torn apart 2.Buildings are shaken and may fall 3.Gas and sewerage pipes may break 4.Fires may break out

Earthquake animation web sites earth/animations/earthquakes/ma in.htmlhttp:// earth/animations/earthquakes/ma in.html understanding/globe/globe.htmlhttp:// understanding/globe/globe.html arth/earthquakes/ arth/earthquakes/ Task Find these sites and review them to say which helped you understand the topic best – and why.

Homework Write a neat 50 word review of what you have found out for yourself in this lesson from web sites. A. Hazards B. Earthquakes C. Volcanoes