The Structure Of The Earth And Distribution Of Earthquakes And Volcanoes
Bayani Gaba-gaba
The ground beneath your feet feels solid and still, yet it is riding slowly across a planet whose interior is hot enough to melt rock. The Earth is built in layers, and its rigid outer shell is broken into giant slabs called tectonic plates that drift a few centimetres a year, about the speed your fingernails grow. Where these plates meet, the planet shudders, splits and erupts.
In this lesson you will travel from the inner core to the crust, name and place the world's main plates, and learn why earthquakes and volcanoes are not scattered at random but line up neatly along plate boundaries. By the end you will be able to read a world hazard map and explain exactly what is happening at each kind of boundary.
Manufura
- The characteristics of the layers of the Earth: inner core, outer core, mantle, crust, lithosphere.
- The names and location of the main tectonic plates and how tectonic plates move.
- Types of plate boundary: divergent/constructive, convergent/destructive, convergent/collision, conservative/transform and the location of earthquakes and volcanoes.
Takardar Darasi
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Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- Which layer of the Earth is a solid ball of iron and nickel at the centre? A. crust B. mantle C. outer core D. inner core Answer: D
- At which type of plate boundary is new oceanic crust formed? A. conservative/transform B. convergent/collision C. divergent/constructive D. convergent/destructive Answer: C
- Oceanic crust sinks beneath continental crust at a destructive boundary because the oceanic crust is: A. thicker B. denser C. older D. cooler Answer: B
- The main force that moves tectonic plates is: A. tides in the oceans B. the Earth's rotation C. convection currents in the mantle D. gravity from the Moon Answer: C
- The Himalayas were formed at a boundary where: A. two oceanic plates move apart B. two continental plates collide C. plates slide past each other D. oceanic crust subducts under continental crust Answer: B
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