Yr8Jessica

media type="custom" key="21495702" width="70" height="70" Microorganisms video :)

Adaptatiomedia type="custom" key="21407376" width="78" height="78"ns: Kangaroo & Waratah

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= S c i e n e V i d e o o n D r V i c t o r C h a n g=

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Forensic Scientist :
===Forensic scientists provide scientific evidence to use in court to support prosecutions. They examine 'contact trace material' in an investigation. This offers evidence that can link a crime to a suspect. Analysing objects or environments while looking for clues. ===

Earth’s Layers

Earth is made up of layers. Each layer has unique characteristics. CRUST: The crust is the outermost layer of Earth. This layer, on which life exists, is covered with soil, rock, and water. Relative to the thickness of Earth’s other layers, Earth’s crust can be compared in thickness to the shell of an egg or the skin of an apple. The crust is thickest under the continents and thinnest under the oceans. Thickness: 5 to 64 kilometers (varies depending on which type of crust) State: Solid MANTLE: The mantle is Earth’s thickest layer. About 80% of the volume of Earth is contained in Earth’s mantle, which extends from the base of the crust to the liquid outer core. The mantle is gener­ally considered to exist in a solid state, although high temperatures and pressure can cause some of this solid rock to flow like an extremely thick liquid. Thickness: About 2900 kilometers State: Considered solid, but has the quality of plasticity, which means the solid rock in this layer can flow like a thick liquid OUTER CORE: Most of the rock in Earth’s outer core is molten, which means that it acts like a hot liquid. The outer core begins about 2900 kilometers below Earth’s surface. Thickness: About 2250 kilometers State: Molten liquid INNER CORE: Earth’s inner core is incredibly dense, because it is under so much pressure. The in­ner core begins at a depth of about 5150 kilometers below Earth’s surface. Thickness: Radius is about 1300 kilometers State: Solid